Recognize vue.config.mjs (#1128)

Author: davidsickmiller

packages/knip/src/plugins/vue/index.ts

@@ -13,7 +13,7 @@ const enablers = ['vue'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['vue.config.{js,ts}'];
+const config = ['vue.config.{js,ts,mjs}'];
 
 const resolveConfig: ResolveConfig<VueConfig> = async (config, options) => {
   const { manifest } = options;