Declare support for async 2.0.0 (#119)

Author: nex3

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.11.3+15
+
+* Declare support for `async` 2.0.0.
+
 ## 0.11.3+14
 
 * Remove single quote ("'" - ASCII 39) from boundary characters.

pubspec.yaml

@@ -1,10 +1,10 @@
 name: http
-version: 0.11.3+14
+version: 0.11.3+15
 author: "Dart Team <[email protected]>"
 homepage: https://github.com/dart-lang/http
 description: A composable, Future-based API for making HTTP requests.
 dependencies:
-  async: "^1.10.0"
+  async: ">=1.10.0 <3.0.0"
   collection: "^1.5.0"
   http_parser: ">=0.0.1 <4.0.0"
   path: ">=0.9.0 <2.0.0"