add frozen requirements

requirements-freeze.txt

+Click==7.0
+cycler==0.10.0
+dash==1.7.0
+dash-bootstrap-components==0.8.0
+dash-core-components==1.6.0
+dash-html-components==1.0.2
+dash-renderer==1.2.2
+dash-table==4.5.1
+dash-table-experiments==0.6.0
+Flask==1.1.1
+Flask-Compress==1.4.0
+future==0.18.2
+gunicorn==20.0.4
+itsdangerous==1.1.0
+Jinja2==2.10.3
+kiwisolver==1.1.0
+MarkupSafe==1.1.1
+matplotlib==3.1.2
+numpy==1.18.0
+pandas==0.25.3
+patsy==0.5.1
+plotly==4.4.1
+py4pm==0.3
+pyparsing==2.4.6
+python-dateutil==2.8.1
+pytz==2019.3
+retrying==1.3.3
+scipy==1.4.1
+six==1.13.0
+statsmodels==0.10.2
+Werkzeug==0.16.0