Add GHC 8.2 and 8.4

Author: int-index

.travis.yml

@@ -16,6 +16,10 @@ matrix:
       addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3], sources: [hvr-ghc]}}
     - env: CABALVER=1.24 GHCVER=8.0.2
       addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.2], sources: [hvr-ghc]}}
+    - env: CABALVER=1.24 CABALUPGR=1.24.* GHCVER=8.2.2
+      addons: {apt: {packages: [cabal-install-1.24,ghc-8.2.2], sources: [hvr-ghc]}}
+    - env: CABALVER=1.24 CABALUPGR=1.24.* GHCVER=8.4.3
+      addons: {apt: {packages: [cabal-install-1.24,ghc-8.4.3], sources: [hvr-ghc]}}
     - env: CABALVER=head GHCVER=head
       addons: {apt: {packages: [cabal-install-head,ghc-head],  sources: [hvr-ghc]}}