Ensure Readme.md is correct name

[chris-rands]

Also pip does not seem to be synced with the latest repo:

$ sudo -H pip3 install phigaro
Collecting phigaro
  Downloading https://files.pythonhosted.org/packages/21/e9/863f9da4508ae1000f71224f5c391b4344de7c54c26ea719e83895cb5c52/phigaro-0.2.1.8.tar.gz (70kB)
     |████████████████████████████████| 71kB 2.0MB/s 
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/tmp/pip-install-2bdw4v97/phigaro/setup.py", line 2, in <module>
        with open("README.md", "r") as fh:
    FileNotFoundError: [Errno 2] No such file or directory: 'README.md'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /private/tmp/pip-install-2bdw4v97/phigaro/

[PollyTikhonova]

Updated version on pypi