Adding deprecation notice (#115)

* Adding deprecation notice

* pointing to the release

Author: chayim

README.md

@@ -10,6 +10,12 @@
 [![Forum](https://img.shields.io/badge/Forum-RedisTimeSeries-blue)](https://forum.redislabs.com/c/modules/redistimeseries)
 [![Discord](https://img.shields.io/discord/697882427875393627?style=flat-square)](https://discord.gg/KExRgMb)
 
+## Deprecation notice
+
+As of [redis-py 4.0.0](https://pypi.org/project/redis/) this library is deprecated. It's features have been merged into redis-py. Please either install it [from pypy](https://pypi.org/project/redis) or [the repo](https://github.com/redis/redis-py).
+
+--------------------------------
+
 redistimeseries-py is a package that gives developers easy access to RedisTimeSeries module. The package extends [redis-py](https://github.com/andymccurdy/redis-py)'s interface with RedisTimeSeries's API.
 
 ## Installation