Updated the dependency requirement in the README to Alamofire 3.3+.
Updated the dependency requirement in the README to Alamofire 3.3+.

Pluto-tv/AlamofireImage,Pluto-tv/AlamofireImage,Alamofire/AlamofireImage,Baza207/AlamofireImage,sessuru/AlamofireImage,Baza207/AlamofireImage,daniele-pizziconi/AlamofireImage,daniele-pizziconi/AlamofireImage,sessuru/AlamofireImage,Alamofire/AlamofireImage