Require Cabal >= 1.6.

This is needed for the new test hook, because the
PackageName type is new in 1.6.

git-svn-id: https://pandoc.googlecode.com/svn/trunk@1549 788f1e2b-df1e-0410-8736-df70ead52e1b

changelog

@@ -83,6 +83,8 @@ pandoc (1.2)
   * In pandoc.hs, removed optPreserveTabs; instead, tabstop of 0 means
     preserve tabs.
 
+  * Require Cabal >= 1.6.
+
   * Minor code cleanup based on hlint suggestions.
 
 pandoc (1.1)

pandoc.cabal

@@ -1,6 +1,6 @@
 Name:            pandoc
 Version:         1.2
-Cabal-Version:   >= 1.2
+Cabal-Version:   >= 1.6
 Build-Type:      Custom
 License:         GPL
 License-File:    COPYING