Breaking changes in Redis-Py 3+

[airman00]

If you install the latest version of Redis Python Client (3.1.0 at this time) you will receive this error when trying to run the sample code and use the rank_member function for the first time:
AttributeError: 'str' object has no attribute 'items'

This is because of breaking changes that occurred between Redis Client v2.x to v3.x
https://github.com/andymccurdy/redis-py#upgrading-from-redis-py-2x-to-30

This specific issue can be solved as follows, but I'm not sure if other parts may have broken:
https://stackoverflow.com/questions/53553009/not-able-to-insert-data-using-zaddsorted-set-in-redis-using-python

As a super quick fix, you can use redis python client v2.10.6

To install that version of redis run the following:
pip install redis==2.10.6

[YuriHeupa]

I sent a PR #62 that adds support for redis-py 3+, it's pending review, but for those who need to use this lib with redis-py 3+ immediately, here's a workaround:

$ pip install git+git://github.com/YuriHeupa/leaderboard-python.git@ccf3b284db35512950909aed8d1d3436557d3efb 

This command installs the changes from my fork I used to create the PR, which supports the newest version of redis-py.