Improve parameter names

README.md

@@ -5,13 +5,13 @@ A library that extends and improves the default options provided by [BackstopJS]
 
 ``composer require --dev metadrop/backstopjs-addons``
 
-You can override the default destination of the library by adding the following parameter to the extra section 
+You can override the default destination of the library ("tests/backstopjs/common/libraries/backstopjs-addons") by adding the following parameter to the extra section 
 of your project's composer.json file:
 
 ```json
 "extra": {
-        "backstop-addons": {
-          "destinition": "custom/destinition"  
+        "backstopjs-addons": {
+          "path": "custom/destination"  
         }
 ``` 
 

src/InstallerPlugin.php

@@ -54,8 +54,8 @@ public function MoveFiles(Event $event) {
     $root = $composer->getConfig()->get('vendor-dir') . '/..';
 
     $extra = $composer->getPackage()->getExtra();
-    $backstop_addons_extras = $extra['backstop-addons'] ?? [];
-    $destination = $backstop_addons_extras['destination'] ?? 'tests/backstopjs/common/libraries/backstopjs-addons';
+    $backstop_addons_extras = $extra['backstopjs-addons'] ?? [];
+    $destination = $backstop_addons_extras['path'] ?? 'tests/backstopjs/common/libraries/backstopjs-addons';
     $destination = "{$root}/{$destination}";
 
     if (is_dir($destination)) {