pubspec cleanup
diff --git a/pubspec.yaml b/pubspec.yaml
index 4b46b14..f52f4ce 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,11 +3,14 @@
 author: Dart Team <misc@dartlang.org>
 description: A shelf handler for proxying requests to another server.
 homepage: https://github.com/dart-lang/shelf_proxy
+
 environment:
-  sdk: '>=2.0.0-dev <3.0.0'
+  sdk: '>=2.0.0 <3.0.0'
+
 dependencies:
   http: '>=0.9.0 <0.12.0'
   path: '>=1.0.0 <2.0.0'
   shelf: '>=0.5.2 <0.8.0'
+
 dev_dependencies:
   test: ^1.3.0