Ensure PluginManager::get adheres to AbstractPluginManager::get signature

`PluginManager::get()`'s signature prior to this patch was inconsistent
with that of zend-servicemanager's `AbstractPluginManager::get()`
implementation, leading to an error under PHP 7.2. This patch updates
the signature to work correctly.

Author: weierophinney

src/Controller/PluginManager.php

@@ -119,7 +119,7 @@ class PluginManager extends AbstractPluginManager
      * @param  string $name
      * @return DispatchableInterface
      */
-    public function get($name, array $options = null)
+    public function get($name, $options = [], $usePeeringServiceManagers = true)
     {
         $plugin = parent::get($name, $options);
         $this->injectController($plugin);