cmdheight is too high

[ofan]

I saw set cmdheight=3 in ghc.vim, I think the command line is too high here, and most of the time there's no information needs to be displayed in the command line. Perhaps you could add an option to customize it and let the users make the choice.

[OliverUv]

Agreed. A compiler plugin shouldn't waste 2 lines of my gui without letting me disable it easily. At the very least, this should be documented and configurable.

[pjrt]

+1.

[lukerandall]

This is fixed by #21.