Update version in pubspec (#142)

diff --git a/pubspec.yaml b/pubspec.yaml
index 5d44764..dac6d95 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: protoc_plugin
-version: 0.10.5
+version: 11.0.0
 author: Dart Team <misc@dartlang.org>
 description: Protoc compiler plugin to generate Dart code
 homepage: https://github.com/dart-lang/dart-protoc-plugin