Fix README.md instructions
Fix README.md instructions

davidbau/pencilcode,sakagg/pencilcode,Dinuka2013513/pencilcode,sakagg/pencilcode,Dinuka2013513/pencilcode,davidbau/pencilcode,xinan/pencilcode,cacticouncil/pencilcode,dweintrop/pencilcode,cacticouncil/pencilcode,cacticouncil/pencilcode,davidbau/pencilcode,dweintrop/pencilcode,cacticouncil/pencilcode,davidbau/pencilcode,dweintrop/pencilcode,Dinuka2013513/pencilcode,xinan/pencilcode,PencilCode/pencilcode,Dinuka2013513/pencilcode,PencilCode/pencilcode,davidbau/pencilcode,xinan/pencilcode,sakagg/pencilcode,PencilCode/pencilcode,sakagg/pencilcode,xinan/pencilcode,PencilCode/pencilcode,dweintrop/pencilcode