Add GitHub actions

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: Release
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          components: rustfmt
+
+      - name: Cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+      - name: Cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+      - name: Cargo publish
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: actions-rs/cargo@v1
+        with:
+          command: publish
+          args: --token ${{ secrets.CARGO_TOKEN }} -v

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "qrcode-png"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 description = "Generate QR code in png format"