Add a raft of new contributors.

CONTRIBUTORS.rst

@@ -8,7 +8,7 @@ Development Lead
 Contributors
 ````````````
 
-In chronological order:
+In no particular order:
 
 - Sriram Ganesan (@elricL)
 
@@ -38,7 +38,67 @@ In chronological order:
   - Added support for upgrade of plaintext HTTP/1.1 to plaintext HTTP/2.
   - Added proxy support.
   - Improved IPv6 support.
+  - Improved ``Stream`` thread safety.
 
 - Eugene Obukhov (@irvind)
 
   - General code improvements.
+
+- Tim Emiola (@tbetbetbe)
+
+  - Added thread-safety to hyper's HTTP/2 implementation.
+
+- Jason Gowthorpe (@JasonGowthorpe)
+
+  - Added support for removing the bundled certs file.
+
+- Aviv Cohn (@AvivC)
+
+  - Improved some default arguments.
+  - Improved type checking of bodies in HTTP/2 requests.
+
+- Ben Last (@benlast)
+
+  - Improved SSL tests.
+  - Fixed bugs in the SSL compatibility layer.
+
+- Dmitry Simonchik (@mylh)
+
+  - Added support for client certs.
+
+- pkrolikowski (@pkrolikowski)
+
+  - Added support for overriding HTTP/2 default headers from the CLI.
+
+- Ian Cordasco (@sigmavirus24)
+
+  - Fixed documentation bugs.
+  - Fixed Travis builds.
+
+- Collin Anderson (@collinanderson)
+
+  - Documentation improvements.
+
+- Vasiliy Faronov (@vfaronov)
+
+  - Fixed bugs in HTTP/2 upgrade where the header would be set incorrectly.
+
+- Mark Jenkins (@markjenkins)
+
+  - Allowed the result of version negotiation to be forced.
+
+- Masaori Koshiba (@masaori335)
+
+  - Changed the source of the ``check_hostname`` method.
+
+- Kubilay Kocak (@koobs)
+
+  - Packaging improvements.
+
+- Alex Chan (@alexwlchan)
+
+  - Documentation improvements.
+
+- Huayi Zhang (@irachex)
+
+  - Fixed bugs with Python 2.7 compatibility.