Add Data.Monoid.Alternate from prelude v3.3.0

[JordanMartinez]

Fixes #9

[hdgarrood]

CI is failing because we need to update control first.

[JordanMartinez]

Note: the control PR CI is failing because newtype hasn't been updated yet. Moreover, newtype's PR (purescript/purescript-newtype#23) can be merged, but might need to be adjusted later depending on whether we merge something in the purescript compiler repo.

[JordanMartinez]

I think CI will pass now if we restart it

[hdgarrood]

👍 I've just restarted the build. Just so you know, I think that if you sign in with github on travis-ci.org, you'll be able to restart builds too.

[JordanMartinez]

The only repo that shows up on travis-ci.org for me is spago.

CI is now failing with this error. I'll look into it as this PR was submitted using my spago-based approach:

* Building project in /home/travis/build/purescript/purescript-invariant

[1/1 TypesDoNotUnify] src/Data/Functor/Invariant.purs:51:41

  51    imap f _ (Alternate x) = Alternate (f x)

                                              ^

  

  Could not match type

  

    f3 a0

  

  with type

  

    a0

  

  while checking that type t1 t2

    is at least as general as type a0

  while checking that expression x

    has type a0

  in value declaration invariantAlternate

  

  where f3 is a rigid type variable

          bound at (line 0, column 0 - line 0, column 0)

        a0 is a rigid type variable

          bound at (line 0, column 0 - line 0, column 0)

        t1 is an unknown type

        t2 is an unknown type

           Src   Lib   All

Warnings   0     0     0  

Errors     1     0     1  

* ERROR: Subcommand terminated with exit code 1

The command "npm run -s build" exited with 1.
cache.2

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