message: [gbc] Pin gbc-tests to ansi-terminal < 0.6.3
  The Hackage package ansi-terminal as of version 0.6.3 is no longer
  building with GHC 7.8.3, which causes out CI builds to fail.
  Issue has been
  opened about this, but until it is resolved, we need to use an earlier
  version.
diff: @@ -87,6 +87,9 @@ test-suite gbc-tests
  build-depends: bond,
  aeson >= 0.7.0.6 && < 0.12.0.0,
  aeson-pretty == 0.7.2,
  + -- pinned to a lower version pending resolution of
  + -- https://github.com/feuerbach/ansi-terminal/issues/22
  + ansi-terminal < 0.6.3,
  base >= 4.5 && < 5,
  bytestring >= 0.10,
  cmdargs >= 0.10.10,
  