fixed type in README.rst
fixed type in README.rst

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