Langchain redis/release 0.0.4

[bsbodden]

• Changes param name for Redis PY client to redis_client consistently in all classes (it was redis in some classes)
• Adds extra tests for using classes with a Redis PY client
• Bumps the version to 0.0.4

[tylerhutcherson]

Awesome -- let's make sure docs are also reflective of this change if we have examples that show the other keyword. Alternatively could use kwargs to make it backwards compatable with a warning msg or something