[aur-general] migration from mingw32-qt to mingw32-qt4

Hi, i maintain both packages, i made changes to use the new qt4- prefixes and new locations, like the official Qt package did some weeks ago to co-exist with Qt5. I would need some advice about how to direct the people using mingw32-qt to mingw32-qt4, i have made a comment on mingw32-qt, i don't know if would be a good idea to make a fake upgrade to mingw32-qt with a msg or something users of automatic aur upgrade utilities (like yaourt) could see. Any better ideas please? Thanks! Regards, Miguel Angel.