Add CI check ensuring interfaces have return types

Author: wouterj

Generator/ConfigurableRequirementsInterface.php

@@ -40,6 +40,8 @@ interface ConfigurableRequirementsInterface
     /**
      * Enables or disables the exception on incorrect parameters.
      * Passing null will deactivate the requirements check completely.
+     *
+     * @return void
      */
     public function setStrictRequirements(?bool $enabled);
 

RequestContextAwareInterface.php

@@ -15,6 +15,8 @@ interface RequestContextAwareInterface
 {
     /**
      * Sets the request context.
+     *
+     * @return void
      */
     public function setContext(RequestContext $context);