Update ghc-cabal command line usage text.
authorEdward Z. Yang <ezyang@cs.stanford.edu>
Wed, 21 Dec 2016 06:09:16 +0000 (22:09 -0800)
committerEdward Z. Yang <ezyang@cs.stanford.edu>
Wed, 21 Dec 2016 16:56:44 +0000 (08:56 -0800)
commit99db12f54fa5d4dcf264f00c6f97d08d33b587d0
treed9157c1fa18836d4be07ade3eb4bbed7af9e4f57
parentee4e1654c31b9c6f6ad9b19ece25f040bbbcbd72
Update ghc-cabal command line usage text.

Summary:
Old usage text was horribly out-of-date.  Now updated!

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Test Plan: none

Reviewers: bgamari, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2889
utils/ghc-cabal/Main.hs