pubspec conventions dart-lang/site-www#825
diff --git a/pubspec.yaml b/pubspec.yaml
index 23dd525..5d8bbf7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -7,6 +7,7 @@
  a set of options and values using GNU and POSIX style options.
 
 dev_dependencies:
-  test: ">=0.12.0 <0.13.0"
+  test: '>=0.12.0 <0.13.0'
+  
 environment:
-  sdk: ">=1.22.0 <2.0.0"
+  sdk: '>=1.22.0 <2.0.0'