Update Addons Release.md

Author: seanpmorgan

sigs/addons/RELEASE.md

@@ -4,6 +4,7 @@ SIG Addons release process consists of the folowing steps:
 1. Create new rX.X branch on tensorflow/addons
 2. Create and merge a new PR into the release branch
 	* Set the correct version and suffix in [version.py](https://github.com/tensorflow/addons/blob/master/tensorflow_addons/version.py)
+	* Ensure the proper minimum of maximum versions of TF are set in the [ensure_tf util](https://github.com/tensorflow/addons/blob/master/tensorflow_addons/utils/ensure_tf_install.py)
 3. Publish and tag a [release on Github](https://github.com/tensorflow/addons/releases)
     * Add updates for new features, enhancements, bug fixes
     * Add contributors using `git shortlog <last-version>..HEAD -s`
@@ -15,4 +16,4 @@ SIG Addons release process consists of the folowing steps:
 Current Release Team:
 - Sean Morgan - GitHub: [@seanpmorgan](https://github.com/seanpmorgan) - PyPI: [seanmorgan](https://pypi.org/user/seanmorgan/)
 - Yan Facai(颜发才) - GitHub: [@facaiy](https://github.com/facaiy) - PyPI: [facaiy](https://pypi.org/user/facaiy/)
- 
+