* set composer package type to wordpress-plugin

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "wpstudio/media-cloud-transform",
     "description": "Convert attachment meta to compatible with Media Cloud S3",
-    "type": "library",
+    "type": "wordpress-plugin",
     "require": {
         "guzzle/http": "^3.7@dev",
         "symfony/event-dispatcher": "4.4.x-dev",