Describe workaround for false spoofing errors
Describe workaround for false spoofing errors

As described in issue #1470, Paperclip can sometimes raise undesired spoofing errors when working with custom extensions. This adds an example workaround in the README using the public API of the mime-types library that will resolve this issue in a way compatible with Paperclip.
joshisa/paperclip,mdkalish/paperclip,ScotterC/paperclip,mrgilman/paperclip,sopheak-se/paperclip,cmaion/paperclip,gfvcastro/paperclip,mrb/paperclip,freeslugs/paperclip,InesCARodrigues/paperclip,rpbaptist/paperclip,mehulkar/paperclip,victorngkp/paperclip,carnivalmobile/paperclip,justanshulsharma/paperclip,dgynn/paperclip,danielwanja/paperclip,alexandrz/paperclip,greatbody/paperclip,mdkalish/paperclip,medcat/paperclip,onursarikaya/paperclip,rpbaptist/paperclip,raow/paperclip,tylerwillingham/paperclip,tiegz/paperclip,zurb/paperclip,gfvcastro/paperclip,betesh/paperclip,maintux/paperclip,frankpinto/paperclip,tiegz/paperclip,keathley/paperclip,Sporky023/paperclip,justanshulsharma/paperclip,keathley/paperclip,joshisa/paperclip,victorngkp/paperclip,soramugi/paperclip,mrgilman/paperclip,Cohealo/paperclip,sopheak-se/paperclip,sideci-sample/sideci-sample-paperclip,freeslugs/paperclip,InesCARodrigues/paperclip,alexandrz/paperclip,maintux/paperclip,aditya01933/paperclip,pandamako/paperclip,aditya01933/paperclip,raow/paperclip,tylerwillingham/paperclip,ScotterC/paperclip,frankpinto/paperclip,Cohealo/paperclip,soramugi/paperclip,onursarikaya/paperclip,cmaion/paperclip,dgynn/paperclip,mehulkar/paperclip,Sporky023/paperclip,manorie/paperclip,zurb/paperclip,carnivalmobile/paperclip,pandamako/paperclip,medcat/paperclip,greatbody/paperclip,bdewater/paperclip,betesh/paperclip,bdewater/paperclip,mrb/paperclip,manorie/paperclip