Update R0.17 README.md/RELEASE.md, in preparation for release (#1367)

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Author: yongtang

README.md

@@ -112,6 +112,7 @@ of releases [here](https://github.com/tensorflow/io/releases).
 
 | TensorFlow I/O Version | TensorFlow Compatibility | Release Date |
 | --- | --- | --- |
+| 0.17.1 | 2.4.x | Apr 15, 2021 |
 | 0.17.0 | 2.4.x | Dec 14, 2020 |
 | 0.16.0 | 2.3.x | Oct 23, 2020 |
 | 0.15.0 | 2.3.x | Aug 03, 2020 |

RELEASE.md

@@ -1,3 +1,18 @@
+# Release 0.17.1
+
+## Major Features
+* Fixed incomplete row reading issue in parquet files.
+
+## Thanks to our Contributors
+
+This release contains contributions from many people:
+
+Samuel Marks, Tom McTiernan, Vignesh Kothapalli, Yong Tang,
+Yunze Xu, 博琰
+
+We are also grateful to all who filed issues or helped resolve them, asked and
+answered questions, and were part of inspiring discussions.
+
 # Release 0.17.0
 
 ## Major Features