fix: type mismatch for plugin installation

Author: vinpogo

packages/vuebugger/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@vingy/vuebugger",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Vue devtools plugin to debug anything.",
   "keywords": [
     "composable",

packages/vuebugger/src/index.ts

@@ -1,12 +1,12 @@
-import type { Plugin } from 'vue'
+import type { App, Plugin } from 'vue'
 import { setUidGenerator } from './debug'
 import { setupComposableDevtools } from './devtools'
 import { PluginOptions } from './types'
 
 export { debug } from './debug'
 
-const plugin: Plugin<PluginOptions> = {
-  install: (app, options) => {
+const plugin: Plugin<PluginOptions | undefined> = {
+  install: (app: App, options?: PluginOptions) => {
     if (!import.meta.env.DEV) return
     if (options?.uidFn) setUidGenerator(options.uidFn)
     setupComposableDevtools(app)