Go back to testing with ghc 7.10.2.

Avoids the dreaded "the version of cabal being used has
changed" error.

https://www.reddit.com/r/haskell/comments/3f4bgr/the_version_of_cabal_being_used_has_changed/

.travis.yml

@@ -22,9 +22,9 @@ matrix:
     - env: CABALVER=1.18 GHCVER=7.8.4 GHCOPTS=-Werror
       compiler: ": #GHC 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 GHCOPTS=-Werror
-      compiler: ": #GHC 7.10.3"
-      addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3], sources: [hvr-ghc]}}
+    - env: CABALVER=1.22 GHCVER=7.10.2 GHCOPTS=-Werror
+      compiler: ": #GHC 7.10.2"
+      addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.2], sources: [hvr-ghc]}}
 
 before_install:
  - unset CC

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 == 7.10.3
+Tested-With:     GHC == 7.4.2, GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.2
 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