updated release notes

doc/release-notes.md

 # Release notes
 
-Current version of Zefyr editor is `0.7` ([changelog](./../packages/zefyr/CHANGELOG.md)).
+Current version of Zefyr editor is `0.7.0` ([changelog](./../packages/zefyr/CHANGELOG.md)).
 
-### 0.7
+### 0.7.0
 
 __This is a breaking change release.__
 
 
 Highlights of this release include:
 
-* Zefyr no longer depends on `image_picker` package. This introduced breaking
-  changes described in the changelog.
-* Selection overlay has been refactored to enable customization work in
-  follow up releases.
-* Zefyr now supports selection-only workflow via new `ZefyrMode` object which
-  replaces previous `enabled` field (breaking change).
+* Zefyr no longer depends on `image_picker` package. This introduced breaking changes described in the changelog. Also see [Embedding Images](images.md) document for details on implementing an image delegate for `image_picker` plugin.
+* Selection overlay has been refactored to enable customization work in follow up releases.
+* Zefyr now supports selection-only workflow via new `ZefyrMode` object which replaces previous `enabled` field (breaking change).
 
 For more details on breaking changes and upgrade instructions please read
 [changelog](./../packages/zefyr/CHANGELOG.md).