Merge pull request #115 from dart-lang/2.0_constraint

use the new 2.0 constraint
diff --git a/pubspec.yaml b/pubspec.yaml
index 564ba2e..7717699 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -9,7 +9,7 @@
 author: Dart Team <misc@dartlang.org>
 
 environment:
-  sdk: '>=1.24.0 <2.0.0'
+  sdk: '>=1.24.0 <2.0.0-dev.infinity'
 
 dependencies:
   path: ^1.4.0