Merge pull request #2286 from haskell/jneira/install-ghc-list-msg

Note in the install script that listed ghcs are the supported ones

Author: michaelpj

install/src/Env.hs

@@ -51,7 +51,7 @@ findInstalledGhcs = do
 
 showInstalledGhcs :: MonadIO m => [(VersionNumber, GhcPath)] -> m ()
 showInstalledGhcs ghcPaths = do
-  let msg = "Found the following GHC paths: \n"
+  let msg = "Found the following *supported by HLS* GHC paths: \n"
               ++ unlines
                   (map (\(version, path) -> "ghc-" ++ version ++ ": " ++ path)
                     ghcPaths