Added mga 4 as latest to fix travis-ci build fail and removed the new mga 55 for now.

library/mageia

@@ -1,6 +1,5 @@
 # maintainer: Juan Luis Baptiste <[email protected]> (@juanluisbaptiste)
 
-latest: git://github.com/juanluisbaptiste/docker-brew-mageia@d84146e59656803388ed8c6789e27cac341274c8 5
+latest: git://github.com/juanluisbaptiste/docker-brew-mageia@9dde5fca0ba75eddab7831b67869f886c4c16e70 4 
 cauldron: git://github.com/juanluisbaptiste/docker-brew-mageia@5adb71a8270dca00f7e4f071b3c7318dda2a28de cauldron
 4: git://github.com/juanluisbaptiste/docker-brew-mageia@9dde5fca0ba75eddab7831b67869f886c4c16e70 4
-5: git://github.com/juanluisbaptiste/docker-brew-mageia@d84146e59656803388ed8c6789e27cac341274c8 5