feat: add requirements_freeze.txt file to help lock down a working en…

…vironment (#155)

* feat: add pip_freeze.txt file to help lock down a working environment

requirements_freeze.txt

@@ -0,0 +1,28 @@
+asn1crypto==1.3.0
+atomicwrites==1.3.0
+attrs==19.3.0
+bcrypt==3.1.7
+cffi==1.14.0
+cryptography==2.4.2
+geographiclib==1.50
+geopy==1.20.0
+idna==2.9
+importlib-metadata==1.6.0
+jsonpickle==1.2
+more-itertools==8.2.0
+numpy==1.16.0
+pandas==0.25.3
+paramiko==2.4.2
+pluggy==0.13.1
+py==1.8.1
+pyasn1==0.4.8
+pycparser==2.20
+PyNaCl==1.3.0
+pytest==4.5.0
+python-dateutil==2.8.1
+pytz==2019.3
+scipy==1.2.0
+six==1.14.0
+tqdm==4.29.1
+wcwidth==0.1.9
+zipp==3.1.0