improved README.rst
improved README.rst

Milstein/nodeenv,asottile/nodeenv,chriskuehl/nodeenv,simudream/nodeenv,Milstein/nodeenv,jamesblunt/nodeenv,jhermann/nodeenv,chriskuehl/nodeenv,simudream/nodeenv,jamesblunt/nodeenv,twmt/nodeenv,asottile/nodeenv,twmt/nodeenv