fix ReST rendering in README
fix ReST rendering in README

sathieu/stdeb,astraw/stdeb,LeMeteore/stdeb,astraw/stdeb,pombredanne/stdeb,LeMeteore/stdeb,astraw/stdeb,benthomasson/stdeb,LeMeteore/stdeb,pombredanne/stdeb,benthomasson/stdeb,pombredanne/stdeb,sathieu/stdeb,benthomasson/stdeb,sathieu/stdeb