update authors and readme

Author: yjbanov

README.md

@@ -1,6 +1,6 @@
 # Sentry.io client for Dart
 
-[![Build Status](https://travis-ci.org/yjbanov/sentry.svg?branch=master)](https://travis-ci.org/yjbanov/sentry)
+[![Build Status](https://travis-ci.org/flutter/sentry.svg?branch=master)](https://travis-ci.org/flutter/sentry)
 
 **WARNING: experimental code**
 

pubspec.yaml

@@ -1,8 +1,8 @@
 name: sentry
 version: 0.0.5
 description: A pure Dart Sentry.io client.
-author: Yegor Jbanov <yjbanov@google.com>
-homepage: https://github.com/yjbanov/sentry
+author: Flutter Authors <flutter-dev@googlegroups.com>
+homepage: https://github.com/flutter/sentry
 
 dependencies:
   http: ">=0.11.3+13 <2.0.0"