Update link to my PHP server implementation
Update link to my PHP server implementation

tobscure/json-api-php has been deprecated and succeeded by tobyz/json-api-server.
See https://github.com/tobyzerner/json-api-php/issues/144#issuecomment-723394681
json-api/json-api,json-api/json-api,json-api/json-api,json-api/json-api,json-api/json-api