Fix readme for Pypi

[williamFalcon]

@Borda These lines failed to upload. Commented out for this release:
https://github.com/williamFalcon/pytorch-lightning/blob/master/setup.py#L50-L51

Please run twine check dist/* to see the issues

[Borda]

Ok, I see... I will try to fix it...

Checking distribution dist/pytorch_lightning-0.5.3-py3.6.egg: warning: `long_description_content_type` missing.  defaulting to `text/x-rst`.
Failed
The project's long_description has invalid markup which will not be rendered on PyPI. The following syntax errors were detected:
line 80: Warning: Inline literal start-string without end-string.

[Borda]

seems to be similar to pypa/twine#454 and pypa/twine#495 and pypa/twine#479
also here - https://gitmemory.com/issue/pypa/twine/454/508880105
I am preparing the fix in https://github.com/Borda/pytorch-lightning/tree/issue_468 :)

[Borda]

with upgrading to twine==2.0 I got following error

Checking dist/pytorch-lightning-0.5.3.tar.gz: FAILED
  `long_description` has syntax errors in markup and would not be rendered on PyPI.
    line 80: Error: Unexpected indentation.
  warning: `long_description_content_type` missing.  defaulting to `text/x-rst`.

but the setup.py contains:

long_description=open('README.md', encoding='utf-8').read(),
long_description_content_type='text/markdown',

[Borda]

maybe related also to pypi/warehouse#4079