Add version range pinning to requirements.txt, and test

[mafrosis]

Currently, requirements.txt looks like this:

arrow
click
cryptography
dictdiffer
jsonlines
oauthlib
pandas
pyjwt
requests
requests_oauthlib
tabulate
tqdm
typing_inspect
urllib3

It should at least specify maximum and minimum Major versions of dependencies, like so:

arrow>0.15,<0.16

All dependencies need this, and each will need to be tested with the minimum version..