Test with GHC 8.4.2 instead of 8.4.1.

Author: svenpanne

.travis.yml

@@ -40,9 +40,9 @@ matrix:
     - compiler: "ghc-8.2.2"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
       addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.2.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.4.1"
+    - compiler: "ghc-8.4.2"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.4.1], sources: [hvr-ghc]}}
+      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.4.2], sources: [hvr-ghc]}}
     - compiler: "ghc-head"
       env: GHCHEAD=true
       addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-head], sources: [hvr-ghc]}}

OpenGL.cabal

@@ -25,7 +25,7 @@ tested-with:
   GHC == 7.10.3
   GHC == 8.0.2
   GHC == 8.2.2
-  GHC == 8.4.1
+  GHC == 8.4.2
   GHC == 8.5.*
 cabal-version: >= 1.10
 extra-source-files: