Update README.rst
Update README.rst

Empirically, sprout requires both arguments. Updating doco to suit.
kennethreitz/legit,wkentaro/legit,blueyed/legit,deshion/legit,ericmjl/legit,hickford/legit,kennethreitz/legit,wkentaro/legit,jetgeng/legit,hickford/legit,jetgeng/legit,nxnfufunezn/legit,nxnfufunezn/legit,blueyed/legit,deshion/legit,ericmjl/legit