add what compiler is tested

.travis.yml

@@ -31,6 +31,9 @@ matrix:
   #- env: BUILD=cabal GHCVER=7.2.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
   #  compiler: ": #GHC 7.2.2"
   #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.2.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.4.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
   - env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
     compiler: ": #GHC 7.6.3"
     addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}

git.cabal

@@ -20,6 +20,7 @@ Category:            Development
 Stability:           experimental
 Build-Type:          Simple
 Homepage:            https://github.com/vincenthz/hit
+tested-with:         GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.1
 Cabal-Version:       >=1.8
 data-files:          README.md
 extra-source-files:  Tests/*.hs