googlemaps-3.1.0.tar.gz listed on pypi is missing CHANGELOG.md used in setup.py #307

Hello,
https://files.pythonhosted.org/packages/35/45/e04a8c4fbe721e1e2f73319239812fc479d31a0d6bc790b5e44c9e0ea613/googlemaps-3.1.0.tar.gz is missing the file CHANGELOG.md (and several other files) when compared with https://github.com/googlemaps/google-maps-services-python/archive/3.1.0.tar.gz

Since CHANGELOG.md is read by setup.py installing the package from source fails:

Traceback (most recent call last):
  File "setup.py", line 18, in <module>
    with io.open("CHANGELOG.md", encoding="utf8") as f:
FileNotFoundError: [Errno 2] No such file or directory: 'CHANGELOG.md'

I suppose CHANGELOG.md needs to be added to the MANIFEST.in file.