Consistent formatting

[jchristgit]

So well, although I initially thought this was a good idea, PEP8 specifies that you should not:

Don't use spaces around the = sign when used to indicate a keyword argument or a default parameter value.

See https://www.python.org/dev/peps/pep-0008/#other-recommendations. My bad.

In addition to this, #26 introduced Travis integration and merging this would break the build. 😢