Added dev_requirements.txt

dev_requirements.txt

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+alabaster==0.7.12
+astroid==2.2.5
+Babel==2.7.0
+certifi==2019.3.9
+chardet==3.0.4
+doc8==0.8.0
+docutils==0.14
+idna==2.8
+imagesize==1.1.0
+isort==4.3.20
+Jinja2==2.10.1
+lazy-object-proxy==1.4.1
+MarkupSafe==1.1.1
+mccabe==0.6.1
+packaging==19.0
+pbr==5.2.0
+Pygments==2.4.2
+pylint==2.3.1
+pyparsing==2.4.0
+pytz==2019.1
+requests==2.22.0
+restructuredtext-lint==1.3.0
+six==1.12.0
+snowballstemmer==1.2.1
+Sphinx==2.0.1
+sphinxcontrib-applehelp==1.0.1
+sphinxcontrib-devhelp==1.0.1
+sphinxcontrib-htmlhelp==1.0.2
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.2
+sphinxcontrib-serializinghtml==1.1.3
+stevedore==1.30.1
+typed-ast==1.3.5
+urllib3==1.25.3
+wrapt==1.11.1