readme: correcting WorldSynth version
readme: correcting WorldSynth version

Former-commit-id: dd0b3424c60ef55307de4de9970e103e37078c94
tmfoltz/worldengine,Mindwerks/worldengine,MM1nd/worldengine,psi29a/worldengine,esampson/worldengine,esampson/worldengine,MM1nd/worldengine,Mindwerks/worldengine,sylvanmist/worldengine,sylvanmist/worldengine,tmfoltz/worldengine,psi29a/worldengine