Release 0.6.5.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1646973002 .
diff --git a/pubspec.yaml b/pubspec.yaml
index 231c612..0c33a02 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: shelf
-version: 0.6.5-dev
+version: 0.6.5
 author: Dart Team <misc@dartlang.org>
 description: Web Server Middleware for Dart
 homepage: https://github.com/dart-lang/shelf
@@ -15,7 +15,3 @@
   http: '>=0.9.2 <0.12.0'
   scheduled_test: '^0.12.0'
   test: '^0.12.0'
-
-dependency_overrides:
-  stream_channel:
-    git: git://github.com/dart-lang/stream_channel