Bump cabal-install version number to 1.18.0.2

cabal-install/cabal-install.cabal

 Name:               cabal-install
-Version:            1.18.0.1
+Version:            1.18.0.2
 Synopsis:           The command-line interface for Cabal and Hackage.
 Description:
     The \'cabal\' command-line program simplifies the process of managing