updated readme with a more relevant example for invalidation tokens
updated readme with a more relevant example for invalidation tokens

zenkimoto/BrightFutures,hoanganh6491/BrightFutures,tranhieutt/BrightFutures,Thomvis/BrightFutures,MattesGroeger/BrightFutures,Thomvis/BrightFutures,tranhieutt/BrightFutures,zhaar/BrightFutures,zenkimoto/BrightFutures,MattesGroeger/BrightFutures,zhaar/BrightFutures,morizotter/BrightFutures,Noobish1/BrightFutures,Noobish1/BrightFutures,hoanganh6491/BrightFutures,morizotter/BrightFutures