Tests missing in hex.pm package about cth_readable

[ferd]

The tests won't give you good results, since they're tests that willingly break and fail so that I can manually check the output that results. I willingly did not check them in because they're not meant to pass.

I never found a good enough solid way to deal with things such as color, suppressed output, and so on, for a test suite while running the test suite itself and just left it manual since I update this lib once every couple of years.