diff --git a/.gitignore b/.gitignore
index b512c09..bcafa6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-node_modules
\ No newline at end of file
+node_modules
+/coverage
+/.nyc_output
diff --git a/package-lock.json b/package-lock.json
index da78fdf..216c81a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,113 @@
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   "requires": true,
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+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
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+      "dev": true,
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+        "esutils": "^2.0.2",
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+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.0.tgz",
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+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.4.0",
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@@ -267,6 +368,18 @@
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@@ -294,6 +407,12 @@
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@@ -366,12 +485,33 @@
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+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
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+      "requires": {
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@@ -445,12 +597,27 @@
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+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/bind-obj-methods/-/bind-obj-methods-2.0.0.tgz",
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@@ -496,51 +663,24 @@
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-      "integrity": "sha1-7Lt5D1aNQAmKYkK1SAXHWAXrk48=",
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@@ -605,6 +745,12 @@
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@@ -615,6 +761,12 @@
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@@ -712,12 +864,27 @@
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+    "combined-stream": {
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+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.7.tgz",
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@@ -824,6 +991,20 @@
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@@ -846,6 +1027,15 @@
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-      "integrity": "sha1-oSTf56S2YnnG9lrtxU7Fl3RkJos=",
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+      "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-7.0.0.tgz",
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-          "integrity": "sha1-ykMJ2t7mtUzAuNJH6NfHoJdb3Js=",
-          "dev": true
-        }
+        "events-to-array": "^1.0.1",
+        "js-yaml": "^3.2.7",
+        "minipass": "^2.2.0"
       }
     },
     "text-extensions": {
@@ -6506,6 +8192,18 @@
         "xtend": "~4.0.1"
       }
     },
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/tmatch/-/tmatch-4.0.0.tgz",
+      "integrity": "sha512-Ynn2Gsp+oCvYScQXeV+cCs7citRDilq0qDXA6tuvFwDgiYyyaq7D5vKUlAPezzZR5NDobc/QMeN6e5guOYmvxg==",
+      "dev": true
+    },
+    "to-fast-properties": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/to-object-path/-/to-object-path-0.3.0.tgz",
@@ -6548,6 +8246,24 @@
         "repeat-string": "^1.6.1"
       }
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+    "tough-cookie": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "dev": true,
+      "requires": {
+        "psl": "^1.1.24",
+        "punycode": "^1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
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+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        }
+      }
+    },
     "traverse": {
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       "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
@@ -6566,6 +8282,66 @@
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       "dev": true
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+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
+      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
+      "dev": true
+    },
+    "trivial-deferred": {
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+      "resolved": "https://registry.npmjs.org/trivial-deferred/-/trivial-deferred-1.0.1.tgz",
+      "integrity": "sha1-N21NKdlR1jaKb3oK6FwvTV4GWPM=",
+      "dev": true
+    },
+    "ts-node": {
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.0.3.tgz",
+      "integrity": "sha512-2qayBA4vdtVRuDo11DEFSsD/SFsBXQBRZZhbRGSIkmYmVkWjULn/GGMdG10KVqkaGndljfaTD8dKjWgcejO8YA==",
+      "dev": true,
+      "requires": {
+        "arg": "^4.1.0",
+        "diff": "^3.1.0",
+        "make-error": "^1.1.1",
+        "source-map-support": "^0.5.6",
+        "yn": "^3.0.0"
+      },
+      "dependencies": {
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+          "version": "3.5.0",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
+          "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
+          "dev": true
+        }
+      }
+    },
+    "tsame": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/tsame/-/tsame-2.0.1.tgz",
+      "integrity": "sha512-jxyxgKVKa4Bh5dPcO42TJL22lIvfd9LOVJwdovKOnJa4TLLrHxquK+DlGm4rkGmrcur+GRx+x4oW00O2pY/fFw==",
+      "dev": true
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
+    },
+    "typescript": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.3.tgz",
+      "integrity": "sha512-FFgHdPt4T/duxx6Ndf7hwgMZZjZpB+U0nMNGVCYPq0rEzWKjEDobm4J6yb3CS7naZ0yURFqdw9Gwc7UOh/P9oQ==",
+      "dev": true
+    },
     "uglify-js": {
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       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.4.tgz",
@@ -6586,6 +8362,39 @@
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+    "unicode-length": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/unicode-length/-/unicode-length-1.0.3.tgz",
+      "integrity": "sha1-Wtp6f+1RhBpBijKM8UlHisg1irs=",
+      "dev": true,
+      "requires": {
+        "punycode": "^1.3.2",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
     "union-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
@@ -6676,6 +8485,15 @@
         }
       }
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
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     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
@@ -6706,6 +8524,12 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -6716,6 +8540,17 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -6799,6 +8634,17 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write-file-atomic": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
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     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -6811,10 +8657,16 @@
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       "dev": true
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-    "yamlish": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/yamlish/-/yamlish-0.0.7.tgz",
-      "integrity": "sha1-tK+aHcxjYYhzw9bkUewyE8OaV/s=",
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
+    "yapool": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/yapool/-/yapool-1.0.0.tgz",
+      "integrity": "sha1-9pPymjFbUNmp2iZGp6ZkXJaYW2o=",
       "dev": true
     },
     "yargs": {
@@ -6899,6 +8751,12 @@
           "dev": true
         }
       }
+    },
+    "yn": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
+      "integrity": "sha512-kKfnnYkbTfrAdd0xICNFw7Atm8nKpLcLv9AZGEt+kczL/WQVai4e2V6ZN8U/O+iI6WrNuJjNNOyu4zfhl9D3Hg==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 2a01fb5..cae35cb 100644
--- a/package.json
+++ b/package.json
@@ -21,11 +21,17 @@
   "main": "./index.js",
   "dependencies": {},
   "devDependencies": {
-    "tap": "0.3.x",
-    "semantic-release": "16.0.0-beta.18"
+    "semantic-release": "16.0.0-beta.18",
+    "tap": "^12.6.1"
   },
   "scripts": {
-    "test": "node node_modules/tap/bin/tap.js tests/index.js"
+    "test": "tap --coverage tests/index.js",
+    "coverage": "tap --coverage-report=html && open coverage/lcov-report/index.html"
+  },
+  "nyc": {
+    "exclude": [
+      "tests/"
+    ]
   },
   "tags": [
     "event",