Release 0.5

[0.5] - 2018-04-15

Added

• Support for MacOS, courtesy of Judah Jacobson. See
  #165.

• Support for data attributes in haskell_binary and haskell_library
  rules. See #167.

• Output on building of GHC bindists so it's clearer what went wrong in case
  of a failure.

• haskell_repl rule allowing to interact with GHCi. See
  #82.

• Support for GHC 8.4.1 bindist. See
  #175.

• haskell_lint rule. See
  #181.

• haskell_doctest rule. See
  #194.

Changed

• Improved hermeticity of builds. See
  #180.

• cc_haskell_import now works with haskell_binary targets as well. See
  #179.