Bump redis from 2.10.6 to 3.4.1

Bumps [redis](https://github.com/andymccurdy/redis-py) from 2.10.6 to 3.4.1.
- [Release notes](https://github.com/andymccurdy/redis-py/releases)
- [Changelog](https://github.com/andymccurdy/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@2.10.6...3.4.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

setup.py

@@ -23,7 +23,7 @@ def get_version():
     zip_safe=False,
     platforms='any',
     python_requires='>=3.6',
-    install_requires=['redis >=2.10.0, <3.0.0',
+    install_requires=['redis >=2.10.0, <4.0.0',
                       'click',
                       'croniter >=0.3.23',
                       'pytz'],