Link to the latest pre-release (#2440)

Author: chayim

README.md

@@ -6,6 +6,7 @@ The Python interface to the Redis key-value store.
 [![docs](https://readthedocs.org/projects/redis/badge/?version=stable&style=flat)](https://redis-py.readthedocs.io/en/stable/)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 [![pypi](https://badge.fury.io/py/redis.svg)](https://pypi.org/project/redis/)
+[![pre-release](https://img.shields.io/github/v/release/redis/redis-py?include_prereleases&label=latest-prerelease)](https://github.com/redis/redis-py/releases)
 [![codecov](https://codecov.io/gh/redis/redis-py/branch/master/graph/badge.svg?token=yenl5fzxxr)](https://codecov.io/gh/redis/redis-py)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/redis/redis-py.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/redis/redis-py/alerts/)