Bump redis from 3.1.0 to 3.2.1

Bumps [redis](https://github.com/andymccurdy/redis-py) from 3.1.0 to 3.2.1.
- [Release notes](https://github.com/andymccurdy/redis-py/releases)
- [Changelog](https://github.com/andymccurdy/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@3.1.0...3.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -33,7 +33,7 @@ psycopg2-binary==2.7.7
 pyIsEmail==1.3.2
 # pyOpenSSL==18.0.0
 python3-linkedin==1.0.2
-redis==3.1.0
+redis==3.2.1
 # requests==2.20.0
 # scikit-learn==0.20.0
 # scipy==1.1.0