Add CLA link to README.
Add CLA link to README.

thomaslevesque/cake,adamhathcock/cake,ferventcoder/cake,ferventcoder/cake,thomaslevesque/cake,mholo65/cake,daveaglick/cake,Sam13/cake,patriksvensson/cake,gep13/cake,RehanSaeed/cake,phrusher/cake,cake-build/cake,devlead/cake,Sam13/cake,phenixdotnet/cake,phrusher/cake,Julien-Mialon/cake,gep13/cake,cake-build/cake,vlesierse/cake,robgha01/cake,DixonD-git/cake,Julien-Mialon/cake,RehanSaeed/cake,devlead/cake,phenixdotnet/cake,mholo65/cake,robgha01/cake,daveaglick/cake,patriksvensson/cake,adamhathcock/cake,vlesierse/cake