GHC 8 compatibility

[Michael Walker]

Can't support GHC 8 yet because of not-yet-updated dependencies:

While constructing the BuildPlan the following exceptions were encountered:

--  Failure when adding dependencies:    
      mono-traversable: needed (>=0.2), couldn't resolve its dependencies
    needed for package: chunked-data-0.2.0

--  Failure when adding dependencies:    
      chunked-data: needed (-any), couldn't resolve its dependencies
      mono-traversable: needed (>=0.5), couldn't resolve its dependencies
    needed for package: conduit-combinators-1.0.3.1

--  Failure when adding dependencies:    
      stm-conduit: needed (>=2.5), couldn't resolve its dependencies
    needed for package: irc-client-0.3.0.0

--  Failure when adding dependencies:    
      vector-instances: needed (-any), couldn't resolve its dependencies
    needed for package: mono-traversable-0.10.2

--  Failure when adding dependencies:    
      data-default-class: needed (>=0.0.1 && <0.1), 0.1.0 found (latest applicable is 0.0.1)
    needed for package: pointed-5

--  Failure when adding dependencies:    
      conduit-combinators: needed (>=0.3), couldn't resolve its dependencies
      transformers: needed (>=0.2 && <0.5), 0.5.2.0 found (latest applicable is 0.4.3.0)
    needed for package: stm-conduit-2.8.0

--  Failure when adding dependencies:    
      pointed: needed (>=3), couldn't resolve its dependencies
    needed for package: vector-instances-3.3.1

Wait for a bit, and then rewrite things if dependencies don't get updated soon.

[Michael Walker]

Fixed in 0.4