add contributors info and change version to 0.9.0 for Dart 2 version.

Author: jumperchen

README.md

@@ -79,4 +79,7 @@ If you are new to Git or GitHub, please read [this guide](https://help.github.co
 
 ## Socket.io Dart Client
 
-* [socket.io-client-dart](https://github.com/rikulo/socket.io-client-dart)
+* [socket.io-client-dart](https://github.com/rikulo/socket.io-client-dart)
+
+## Contributors
+* Thanks [@felangel](https://github.com/felangel) for https://github.com/rikulo/socket.io-dart/issues/7

pubspec.yaml

@@ -1,6 +1,6 @@
 name: socket_io
 description: Dartlang port of socket.io
-version: 0.8.2
+version: 0.9.0
 author: jumperchen <jumperchen@potix.com>
 homepage: https://www.zkoss.org