fix utf-8 encoding when reading the readme.rst

[chanansh]

fixing this encoding resolves the installation issue #46 in Windows.

[coveralls]

Coverage remained the same at 82.418% when pulling 54a1377 on chanansh:fix_setup.py_encoding_to_utf-8_for_windows into cf9d4f0 on theskumar:master.

[chanansh]

Hi @theskumar . please help me pass the tests. I don't know why it fails.

[theskumar]

Looking at it.

[aniketmaithani]

@chanansh I think it's a simple flake8 issue. Just fix your 1 indent = 4 spaces :P in your editor settings and voila IT SHALL PASS :D

here is the error message :)

/home/travis/build/theskumar/python-dotenv/setup.py:6:1: W191 indentation contains tabs
/home/travis/build/theskumar/python-dotenv/setup.py:7:1: W191 indentation contains tabs
/home/travis/build/theskumar/python-dotenv/setup.py:9:1: W191 indentation contains tabs
/home/travis/build/theskumar/python-dotenv/setup.py:10:1: W191 indentation contains tabs
/home/travis/build/theskumar/python-dotenv/setup.py:11:1: W191 indentation contains tabs
/home/travis/build/theskumar/python-dotenv/setup.py:14:1: E101 indentation contains mixed spaces and tabs

[theskumar]

This is fixed in v0.6.3, thanks for PR @chanansh