Bug fix and code style

ahoy.yml

 ahoyapi: v2
 commands:
   update:
-    cmd: composer ahoy "$@"
+    cmd: composer lakedrops:ahoy "$@"
     usage: Update Ahoy setup in project

src/Plugin.php

@@ -30,7 +30,7 @@ class Plugin extends BasePlugin {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     return array(
       ScriptEvents::POST_CREATE_PROJECT_CMD => 'updateScripts',
       ScriptEvents::POST_INSTALL_CMD => 'updateScripts',