Regenerated byebye.cabal so the project can be built from a fresh clone

After a fresh clone of the repo, I was unable to build the project with stack build. This was because the byebye.cabal file was missing text as a dependency.

To fix this all I had to do was delete byebye.cabal and run stack build again which regenerated the byebye.cabal file for us.

I also noticed that you didn't have a .gitignore file. I went ahead and added one that ignores both .stack-work and dist-newstyle which are the build artifacts for stack and cabal.