Added homepage to cabal

Author: basvandijk

dstring.cabal

@@ -13,6 +13,7 @@ License-file: LICENSE
 Author: Bas van Dijk <v.dijk.bas@gmail.com>
 Maintainer: Bas van Dijk <v.dijk.bas@gmail.com>
 Copyright: 2009-2011 Bas van Dijk <v.dijk.bas@gmail.com>
+Homepage: https://github.com/basvandijk/dstring/
 Bug-Reports: https://github.com/basvandijk/dstring/issues
 Cabal-version: >= 1.6
 Build-Type: Simple