Update to support composer-plugin-api v2

composer.json

@@ -4,7 +4,7 @@
   "type": "composer-plugin",
   "license": "BSD-2-Clause",
   "require": {
-    "composer-plugin-api": "^1.1"
+    "composer-plugin-api": "^1.1 || ^2.0"
   },
   "require-dev": {
     "totten/process-helper": "^1.0.1",

src/AssetPlugin.php

@@ -38,6 +38,14 @@ class AssetPlugin implements PluginInterface, EventSubscriberInterface, Capable
     $this->publisher = new Publisher($composer, $io);
   }
 
+  public function deactivate(Composer $composer, IOInterface $io) {
+    // NOTE: This method is only valid on composer v2.
+  }
+
+  public function uninstall(Composer $composer, IOInterface $io) {
+    // NOTE: This method is only valid on composer v2.
+  }
+
   /**
    * {@inheritdoc}
    */