Add return types, remove unused locales

Author: Philo Hamel

README.md

@@ -10,7 +10,7 @@
 ## Requirements
 
 * CakePHP 3.7.0 or greater.
-* PHP 7.0.0 or greater.
+* PHP 7.1.0 or greater.
 
 ## Installation
 ```

phpstan.neon

@@ -3,4 +3,4 @@ parameters:
         - tests/bootstrap.php
 
     ignoreErrors:
-        - '#Result of method .+QueueTaskInterface::run\(\) \(void\) is used.#'
+        - '#Result of method .+QueueTaskInterface::run\(\) \(void\) is used.#'