Travis: test with ghc 8.0.1, remove testing with ghc 7.4.

.travis.yml

@@ -28,9 +28,6 @@ matrix:
   include:
   # We grab the appropriate GHC and cabal-install versions from hvr's PPA. See:
   # https://github.com/hvr/multi-ghc-travis
-  - env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16
-    compiler: ": #GHC 7.4.2"
-    addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2], sources: [hvr-ghc]}}
   - env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16
     compiler: ": #GHC 7.6.3"
     addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3], sources: [hvr-ghc]}}
@@ -41,6 +38,10 @@ matrix:
     compiler: ": #GHC 7.10.3"
     addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3], sources: [hvr-ghc]}}
 
+  - env: BUILD=cabal GHCVER=8.0.1 CABALVER=1.24
+    compiler: ": #GHC 8.0.1"
+    addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.1], sources: [hvr-ghc]}}
+
   # Build with the newest GHC and cabal-install. This is an accepted failure,
   # see below.
   - env: BUILD=cabal GHCVER=head  CABALVER=head
@@ -53,6 +54,10 @@ matrix:
     compiler: ": #stack 7.10.3"
     addons: {apt: {packages: [ghc-7.10.3], sources: [hvr-ghc]}}
 
+  - env: BUILD=stack ARGS="--resolver lts-6"
+    compiler: ": #stack 7.10.3"
+    addons: {apt: {packages: [ghc-7.10.3], sources: [hvr-ghc]}}
+
   # Nightly builds are allowed to fail
   - env: BUILD=stack ARGS="--resolver nightly"
     compiler: ": #stack nightly"
@@ -62,6 +67,10 @@ matrix:
     compiler: ": #stack 7.10.3 osx"
     os: osx
 
+  - env: BUILD=stack ARGS="--resolver lts-6"
+    compiler: ": #stack 7.10.3 osx"
+    os: osx
+
   - env: BUILD=stack ARGS="--resolver nightly"
     compiler: ": #stack nightly osx"
     os: osx

pandoc.cabal

@@ -11,7 +11,7 @@ Bug-Reports:     https://github.com/jgm/pandoc/issues
 Stability:       alpha
 Homepage:        http://pandoc.org
 Category:        Text
-Tested-With:     GHC == 7.4.2, GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.2
+Tested-With:     GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.2, GHC == 8.0.1
 Synopsis:        Conversion between markup formats
 Description:     Pandoc is a Haskell library for converting from one markup
                  format to another, and a command-line tool that uses