ipwhois does not specify an install version, which caused tests to fail in some environments

[S4lt5]

Somehow or another, in a test environment, "ipwhois" was installed at 0.XX instead of 1.2.0.

Running setup.py on this environment caused no complaints, but inexplicably the tests failed.

If I did not run the tests first, I would have not known anything was wrong.

https://github.com/cisagov/findcdn/blob/7bbf50e4a1cf1f32999c1abdcabc064d8ebf53f8/setup.py#L93

I would suggest that:

• Tests get run on setup.py to make sure everything is actually working
• minimum version numbers are explicitly specified.