Create virtualenv requirements file

requirements.txt

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+brewer2mpl==1.4.1
+cycler==0.10.0
+ggplot==0.11.5
+kiwisolver==1.0.1
+matplotlib==3.0.2
+numpy==1.15.4
+pandas==0.23.4
+patsy==0.5.1
+pkg-resources==0.0.0
+psycopg2-binary==2.7.6.1
+pyparsing==2.3.0
+python-dateutil==2.7.5
+pytz==2018.9
+scipy==1.2.0
+seaborn==0.9.0
+six==1.12.0
+statsmodels==0.9.0