Declare support for async 2.0.0 (flutter#16)

Author: nex3

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 1.1.5
 
+* Declare support for `async` 2.0.0.
+
 * Require Dart 1.23.0.
 
 ## 1.1.4

pubspec.yaml

@@ -1,10 +1,10 @@
 name: glob
-version: 1.1.5-dev
+version: 1.1.5
 author: "Dart Team <[email protected]>"
 homepage: https://github.com/dart-lang/glob
 description: Bash-style filename globbing.
 dependencies:
-  async: "^1.2.0"
+  async: ">=1.2.0 <3.0.0"
   collection: "^1.1.0"
   path: "^1.3.0"
   string_scanner: ">=0.1.0 <2.0.0"