Updated README to indicate version query string param
Updated README to indicate version query string param

- for rest and rpc services

gartner/zf-apigility-admin,ildanno/zf-apigility-admin,jguittard/zf-apigility-admin,jguittard/zf-apigility-admin,guliano/zf-apigility-admin,gartner/zf-apigility-admin,ezimuel/zf-apigility-admin,ezimuel/zf-apigility-admin,ildanno/zf-apigility-admin,guliano/zf-apigility-admin,ezimuel/zf-apigility-admin