Update 1.5.0 in version.py and RELEASE.md#255

Merged

jay90099 merged 1 commit intotensorflow:r1.5.0from jay90099:releng_20211202_124324

Dec 2, 2021

+1-1,154

Commits on Dec 2, 2021

Update 1.5.0 in version.py and RELEASE.md
jay90099
committed