Add static program analysis

[hanzei]

We should measure code coverage to improve your code base.

[hanzei]

@matryer Same problem as with the CI. Can you add this rep to https://codeclimate.com/?

[hanzei]

Ping @matryer

[matryer]

@hanzei Would you like to become a maintainer of this repo?

[hanzei]

@matryer Yes

[matryer]

Done.

[hanzei]

Thanks!