Fix Yogi import (#875) on r0.7 branch (#922)

* Fix Yogi import (#875)


(cherry picked from commit 0a23fd2)

* Increment minor

Author: seanpmorgan

tensorflow_addons/optimizers/__init__.py

@@ -38,3 +38,4 @@
 from tensorflow_addons.optimizers.weight_decay_optimizers import SGDW
 from tensorflow_addons.optimizers.weight_decay_optimizers import (
     extend_with_decoupled_weight_decay)
+from tensorflow_addons.optimizers.yogi import Yogi

tensorflow_addons/version.py

@@ -20,7 +20,7 @@
 # We follow Semantic Versioning (https://semver.org/)
 _MAJOR_VERSION = '0'
 _MINOR_VERSION = '7'
-_PATCH_VERSION = '0'
+_PATCH_VERSION = '1'
 
 # When building releases, we can update this value on the release branch to
 # reflect the current release candidate ('rc0', 'rc1') or, finally, the official