Prepare release

packages/zefyr/CHANGELOG.md

+## 0.6.1
+
+* Relaxed dependency constraint on `image_picker` library to allow latest version. Note that
+  Zefyr 0.7 will stop depending on `image_picker` and introduce some breaking changes, which will
+  be described here when 0.7 is released.
+
 ## 0.6.0
 
 * Updated to support Flutter 1.7.8

packages/zefyr/pubspec.yaml

 name: zefyr
 description: Clean, minimalistic and collaboration-ready rich text editor for Flutter.
-version: 0.6.0
+version: 0.6.1
 author: Anatoly Pulyaevskiy <anatoly.pulyaevskiy@gmail.com>
 homepage: https://github.com/memspace/zefyr