prepare release

doc/release-notes.md

 # Release notes
 
-Current version of Zefyr editor is `0.7.0` ([changelog](./../packages/zefyr/CHANGELOG.md)).
+Current version of Zefyr editor is `0.8.0` ([changelog](./../packages/zefyr/CHANGELOG.md)).
+
+### 0.8.0
+
+This version updates Zefyr to support Flutter 1.9.x.
 
 ### 0.7.0
 

packages/zefyr/CHANGELOG.md

+## 0.8.0
+
+* Updated to support Flutter 1.9.0 (#154)
+
 ## 0.7.0
 
 This release contains breaking changes.

packages/zefyr/pubspec.yaml

 name: zefyr
 description: Clean, minimalistic and collaboration-ready rich text editor for Flutter.
-version: 0.7.0
+version: 0.8.0
 author: Anatoly Pulyaevskiy <anatoly.pulyaevskiy@gmail.com>
 homepage: https://github.com/memspace/zefyr