Added note about Vista to readme.
Added note about Vista to readme.

Signed-off-by: Luis Lavena <8dc158282be10ab41b7ec45768f7a98d79f3ba7e@gmail.com>
auyaauya/rubyinstaller,leonhooijer/rubyinstaller,Rugbyman21/rubyinstaller,haonaturel/rubyinstaller,jaym/rubyinstaller,shirosaki/rubyinstaller,jaym/rubyinstaller,suvarnaraju/rubyinstaller,leonhooijer/rubyinstaller,oneclick/rubyinstaller,leonhooijer/rubyinstaller,modulexcite/rubyinstaller,oneclick/rubyinstaller,shirosaki/rubyinstaller,dreamauya/rubyinstaller,dreamauya/rubyinstaller,oneclick/rubyinstaller,Rugbyman21/rubyinstaller,auyaauya/rubyinstaller,haonaturel/rubyinstaller,shirosaki/rubyinstaller,suvarnaraju/rubyinstaller,jaym/rubyinstaller,zorosteven/rubyinstaller,jahanzaibbahadur/rubyinstaller,modulexcite/rubyinstaller,zorosteven/rubyinstaller,Rugbyman21/rubyinstaller,vemmaverve/rubyinstaller,vemmaverve/rubyinstaller,jahanzaibbahadur/rubyinstaller,haonaturel/rubyinstaller,vemmaverve/rubyinstaller,suvarnaraju/rubyinstaller,zorosteven/rubyinstaller,modulexcite/rubyinstaller,dreamauya/rubyinstaller,jahanzaibbahadur/rubyinstaller,auyaauya/rubyinstaller