README: Update code blocks.
README: Update code blocks.

StanfordLegion/legion,sdalton1/legion,sdalton1/legion,chuckatkins/legion,StanfordLegion/legion,chuckatkins/legion,chuckatkins/legion,sdalton1/legion,StanfordLegion/legion,chuckatkins/legion,chuckatkins/legion,chuckatkins/legion,chuckatkins/legion,StanfordLegion/legion,sdalton1/legion,sdalton1/legion,StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,StanfordLegion/legion