update .travis

.travis.yml

@@ -4,27 +4,24 @@ env:
  - CABALVER=1.18 GHCVER=7.8.4
  - CABALVER=1.22 GHCVER=7.10.3
  - CABALVER=1.24 GHCVER=8.0.2
+ - CABALVER=2.0  GHCVER=8.2.1
  - CABALVER=head GHCVER=head RUNTEST=0
 
 matrix:
+  include:
+    - env: CABALVER=1.18 GHCVER=7.8.4
+      addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4], sources: [hvr-ghc]}}
+    - env: CABALVER=1.22 GHCVER=7.10.3
+      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=2.0 GHCVER=8.2.1
+      addons: {apt: {packages: [cabal-install-2.0,ghc-8.2.1],sources: [hvr-ghc]}}
+    - env: CABALVER=head GHCVER=head
+      addons: {apt: {packages: [cabal-install-head,ghc-head],  sources: [hvr-ghc]}}
   allow_failures:
    - env: CABALVER=head GHCVER=head RUNTEST=0
 
-addons:
-    apt:
-        sources:
-         - hvr-ghc
-        packages:
-         - cabal-install-1.18
-         - cabal-install-1.20
-         - cabal-install-1.22
-         - cabal-install-1.24
-         - cabal-install-head
-         - ghc-7.8.4
-         - ghc-7.10.3
-         - ghc-8.0.2
-         - ghc-head
-
 before_install:
  - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH