Remove coveralls token

[bradyrx]

Description

Removes the coveralls.yml file with our token, since that's not supposed to be public (https://stackoverflow.com/questions/39501417/how-can-i-connect-coveralls-and-travis-in-github). Travis should be able to handle connecting to coveralls, since we're a public repo.

[bradyrx]

Hm, it looks like I need that token for things to work. I'll play around with this later.

[bradyrx]

Trying the simple steps from here: https://github.com/coveralls-clients/coveralls-python.

[coveralls]

Coverage remained the same at 91.531% when pulling 4a40875 on encrypt into d82f115 on master.

[bradyrx]

Thanks @andersy005 for the heads up on this. It looks like with a public repo and Travis, the token is passed behind the scenes to coveralls. You just need the repo token if you're private or using travis pro.