message: updating release table, adding 0.9.1, 0.8.1, 0.7.2 releases
diff: @@ -89,8 +89,11 @@ version of TensorFlow I/O according to the table below:
  | TensorFlow I/O Version | TensorFlow Compatibility | Release Date |
  | --- | --- | --- |
  +| 0.9.1 | 2.0.x | Nov 15, 2019 |
  | 0.9.0 | 2.0.x | Oct 18, 2019 |
  +| 0.8.1 | 1.15.x | Nov 15, 2019 |
  | 0.8.0 | 1.15.x | Oct 17, 2019 |
  +| 0.7.2 | 1.14.x | Nov 15, 2019 |
  | 0.7.1 | 1.14.x | Oct 18, 2019 |
  | 0.7.0 | 1.14.x | Jul 14, 2019 |
  | 0.6.0 | 1.13.x | May 29, 2019 |
  