Declare support for async 2.0.0 (flutter#10)

Author: nex3

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.6.2
+
+* Declare support for `async` 2.0.0.
+
 ## 1.6.1
 
 * Fix the type of `StreamChannel.transform()`. This previously inverted the

pubspec.yaml

@@ -1,12 +1,12 @@
 name: stream_channel
-version: 1.6.2-dev
+version: 1.6.2
 description: An abstraction for two-way communication channels.
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/stream_channel
 environment:
   sdk: '>=1.21.0 <2.0.0'
 dependencies:
-  async: '^1.11.0'
+  async: '>=1.11.0 <3.0.0'
   stack_trace: '^1.0.0'
 dev_dependencies:
   test: '^0.12.18'