Select right GHC 8.0 version

Author: mpickering

.travis.yml

@@ -27,7 +27,7 @@ matrix:
       addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3,happy-1.19.5], sources: [hvr-ghc]}}
     - env: CABALVER=1.24 GHCVER=8.0.2 HAPPYVER=1.19.5
       compiler: ": #GHC 8.0.2"
-      addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.1,happy-1.19.5], sources: [hvr-ghc]}}
+      addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.2,happy-1.19.5], sources: [hvr-ghc]}}
     - env: CABALVER=2.0 GHCVER=8.2.2 HAPPYVER=1.19.5
       compiler: ": #GHC 8.2.2"
       addons: {apt: {packages: [cabal-install-2.0,ghc-8.2.2,happy-1.19.5], sources: [hvr-ghc]}}