* Drop TF2.2 compatibility (#2224)

Author: seanpmorgan

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
           python configure.py
           bazel test -c opt -k --test_timeout 300,450,1200,3600 --test_output=errors //tensorflow_addons/...
   release-wheel:
-    name: Build release wheels
+    name: Test and build release wheels
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:

README.md

@@ -80,7 +80,7 @@ what it was tested against.
 #### Python Op Compatibility Matrix
 | TensorFlow Addons | TensorFlow | Python  |
 |:----------------------- |:---|:---------- |
-| tfa-nightly | 2.2, 2.3 | 3.6, 3.7, 3.8 | 
+| tfa-nightly | 2.3 | 3.6, 3.7, 3.8 | 
 | tensorflow-addons-0.11.2 | 2.2, 2.3 |3.5, 3.6, 3.7, 3.8 |
 | tensorflow-addons-0.10.0 | 2.2 |3.5, 3.6, 3.7, 3.8 |
 | tensorflow-addons-0.9.1 | 2.1, 2.2 |3.5, 3.6, 3.7 |