Bump version to 2.2 (#247)



Former-commit-id: e1c7a14b29b4bf7c608a02c9d3f60ce195e735ef
diff --git a/gallery/pubspec.yaml b/gallery/pubspec.yaml
index ce5e73b..671cce2 100644
--- a/gallery/pubspec.yaml
+++ b/gallery/pubspec.yaml
@@ -1,7 +1,7 @@
 name: gallery
 description: A resource to help developers evaluate and use Flutter.
 
-version: 2.1.0+020100
+version: 2.2.0+020200
 
 environment:
   sdk: ">=2.3.0 <3.0.0"