README.md: simplify scaladoc link
README.md: simplify scaladoc link

MonsantoCo/cloudformation-template-generator,cibotech/cloudformation-template-generator,joewing/cloudformation-template-generator,MonsantoCo/cloudformation-template-generator,cibotech/cloudformation-template-generator,joewing/cloudformation-template-generator,MonsantoCo/cloudformation-template-generator,joewing/cloudformation-template-generator,cibotech/cloudformation-template-generator