Add requirements.txt

requirements.txt

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+-i https://pypi.org/simple
+alabaster==0.7.10
+babel==2.6.0
+bumpversion==0.5.3
+certifi==2018.4.16
+chardet==3.0.4
+commonmark==0.5.4
+docutils==0.14
+flake8==3.5.0
+httplib2==0.11.3
+idna==2.6
+imagesize==1.0.0
+jinja2==2.10
+markupsafe==1.0
+mccabe==0.6.1
+oauth2client==4.1.2
+packaging==17.1
+pyasn1-modules==0.2.1
+pyasn1==0.4.3
+pycodestyle==2.3.1
+pyflakes==1.6.0
+pygments==2.2.0
+pyparsing==2.2.0
+pytz==2018.4
+recommonmark==0.4.0
+requests==2.18.4
+rsa==3.4.2
+six==1.11.0
+snowballstemmer==1.2.1
+sphinx-rtd-theme==0.4.0
+sphinx==1.7.5
+sphinxcontrib-websupport==1.1.0
+urllib3==1.22