add note about snapshot repository to  readme
add note about snapshot repository to  readme

fegabe/Android-TextView-LinkBuilder,johnjohndoe/Android-TextView-LinkBuilder,mblcdr/Android-TextView-LinkBuilder,tsdl2013/Android-TextView-LinkBuilder,sylsi/Android-TextView-LinkBuilder,0359xiaodong/Android-TextView-LinkBuilder,klinker24/Android-TextView-LinkBuilder,klinker24/Android-TextView-LinkBuilder,MaTriXy/Android-TextView-LinkBuilder,klinker41/Android-TextView-LinkBuilder