修改composer-plugin-api版本，兼容composer2.0

Author: titrxw

composer.json

@@ -4,7 +4,7 @@
 	"description": "php-cs-fixer plugin",
 	"type": "composer-plugin",
 	"require": {
-		"composer-plugin-api": "^1.0",
+		"composer-plugin-api": "^2.0",
 		"friendsofphp/php-cs-fixer": "^2.15"
 	},
 	"require-dev": {

src/Plugin/Plugin.php

@@ -40,6 +40,12 @@ public function activate(Composer $composer, IOInterface $io) {
 		$this->io = $io;
 	}
 
+	public function deactivate(Composer $composer, IOInterface $io) {
+	}
+
+	public function uninstall(Composer $composer, IOInterface $io) {
+	}
+
 	/**
 	 * @return array
 	 */