Enable active for stackage nightly
I've tested locally and it builds (active-0.2.0.10) with GHC 8 now.
This is my first time submitting a pull request for this repo, so here's what I did:
```
cabal unpack active
cd active-0.2.0.10/
stack init --resolver nightly --force
stack build
```
commit37075ebc2d6cfad28928cfe20aca832f64107c6a
authorBartosz Nitka <niteria@gmail.com>
dateMon 11 Jul 2016, 18:56 (10 years ago)
parenta388878
build-constraints.yaml+1−1
@@ -348,7 +348,7 @@ packages:
348348 - picoparsec
349349
350350 "Brent Yorgey <byorgey@gmail.com>":
351− # GHC 8 - active
351+ - active
352352 # GHC 8 - BlogLiterately
353353 # GHC 8 - BlogLiterately-diagrams
354354 # GHC 8 - diagrams