Remove Code Climate badge from the README
Remove Code Climate badge from the README

Code Climate score went from the max 4.0 to a lousy 1.0 for no
reason, when no changes were committed to the project.

I don't like to remove transparency like this, but this could be seen
as project quality decreasing, while there was nothing changed.
I am semi-temporarily removing this until I take the time to
investigate on what happened (if I ever do so, life is short).

I also became frustrated with Code Climate deciding to use their ESLint
configuration for linting while this project was using another
configuration (ant not using ESLint!). Again, maybe I'll re-add later,
if I think such metric is actually relevant (it did find some unused
variables and missing semicolons, so I would like to add it back).

astorije/chai-immutable,astorije/chai-immutable