Update README.md with info related to version 1.3
Update README.md with info related to version 1.3

dfodor/DraggablePanel,hoangsondev/DraggablePanel,SPBTV/DraggablePanel,qiwx2012/DraggablePanel,ppamorim/DraggablePanel,Thornith/DraggablePanel,hmit/DraggablePanel,FreeDao/DraggablePanel,frakc/DraggablePanel,pedrovgs/DraggablePanel,murat8505/DraggablePanel,Fiddl3/DraggablePanel