README.md: update for changed installation instructions
README.md: update for changed installation instructions

jupvfranco/ponyc,boemmels/ponyc,Praetonus/ponyc,cquinn/ponyc,sgebbie/ponyc,influx6/ponyc,mkfifo/ponyc,boemmels/ponyc,mkfifo/ponyc,dipinhora/ponyc,ryanai3/ponyc,boemmels/ponyc,doublec/ponyc,mkfifo/ponyc,mkfifo/ponyc,jupvfranco/ponyc,mkfifo/ponyc,cquinn/ponyc,jupvfranco/ponyc,ponylang/ponyc,CausalityLtd/ponyc,kulibali/ponyc,lukecheeseman/ponyta,malthe/ponyc,Theodus/ponyc,darach/ponyc,Perelandric/ponyc,Perelandric/ponyc,jemc/ponyc,shlomif/ponyc,boemmels/ponyc,dipinhora/ponyc,shlomif/ponyc,malthe/ponyc,kulibali/ponyc,Theodus/ponyc,ryanai3/ponyc,Perelandric/ponyc,dckc/ponyc,ponylang/ponyc,cquinn/ponyc,Praetonus/ponyc,kulibali/ponyc,pap/ponyc,ryanai3/ponyc,malthe/ponyc,pap/ponyc,Theodus/ponyc,sgebbie/ponyc,Theodus/ponyc,Praetonus/ponyc,doublec/ponyc,jupvfranco/ponyc,jonas-l/ponyc,jemc/ponyc,lukecheeseman/ponyta,cquinn/ponyc,ponylang/ponyc,sgebbie/ponyc,Praetonus/ponyc,CausalityLtd/ponyc,jonas-l/ponyc,darach/ponyc,jonas-l/ponyc,CausalityLtd/ponyc,Perelandric/ponyc,jupvfranco/ponyc,sgebbie/ponyc,dipinhora/ponyc,Theodus/ponyc,malthe/ponyc,boemmels/ponyc,darach/ponyc,pap/ponyc,Perelandric/ponyc,kulibali/ponyc,influx6/ponyc,sgebbie/ponyc,dckc/ponyc,jemc/ponyc,lukecheeseman/ponyta,doublec/ponyc