Fix `compatibility` -> `compat` in README.
Fix `compatibility` -> `compat` in README.

lucasb-eyer/pydensecrf,lucasb-eyer/pydensecrf,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments,lucasb-eyer/pydensecrf