Contributing to Cabal (fix to #2155)

[Martin Vlk]

Hi, I have a fix to https://github.com/haskell/cabal/issues/2155
including tests almost ready locally and I would like to look at how to
propose a pull request on GitHub. Do I fork the cabal repo or do I have
to get commit rights for the main repo?

How does a review process work?

Mind you I am a Haskell beginner and likewise this is my first time
contributing to some other repo on GitHub so I ask for patience. :-)

Martin Vlk