Allow composer v2 API

Change the constraint to allow composer v2 API and add missing PluginInterface methods.

It's not possible to run tests with this version, however, it will probably work correctly
because the plugin does not rely on any API that has been deprecated, modified or changed
its behaviour in composer v2.

Author: pinkeen

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "ext-json": "*",
         "php": ">=5.6.0",
-        "composer-plugin-api": "^1.1"
+        "composer-plugin-api": "~1.1 | ^2"
     },
     "require-dev": {
         "composer/composer": "~1.0",

src/Plugin.php

@@ -35,6 +35,21 @@ public function activate(Composer $composer, IOInterface $io)
         $this->logger = new IOLogger($io);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function deactivate(Composer $composer, IOInterface $io)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function uninstall(Composer $composer, IOInterface $io)
+    {
+    }
+
+
     /**
      * {@inheritdoc}
      */
@@ -70,4 +85,4 @@ public function applyPatches(Composer $composer)
 
         $patcher->patch();
     }
-}
+}