start app on application bootstrap

package.json

 {
   "name": "koishi-nestjs",
-  "version": "1.0.7",
+  "version": "1.0.8",
   "description": "Koishi.js as Nest.js Module",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",

src/koishi.service.ts

 import { App } from 'koishi';
-import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
+import {
+  Inject,
+  Injectable,
+  OnApplicationBootstrap,
+  OnModuleInit,
+} from '@nestjs/common';
 import { KOISHI_MODULE_OPTIONS } from './koishi.constants';
 import { KoishiModuleOptions } from './koishi.interfaces';
 
 @Injectable()
-export class KoishiService extends App implements OnModuleInit {
+export class KoishiService
+  extends App
+  implements OnModuleInit, OnApplicationBootstrap {
   constructor(
     @Inject(KOISHI_MODULE_OPTIONS)
     private koishiModuleOptions: KoishiModuleOptions,
@@ -12,7 +19,7 @@ export class KoishiService extends App implements OnModuleInit {
     super(koishiModuleOptions);
   }
 
-  async onModuleInit() {
+  onModuleInit() {
     if (this.koishiModuleOptions.usePlugins) {
       for (const pluginDesc of this.koishiModuleOptions.usePlugins) {
         const ctx = pluginDesc.select
@@ -21,6 +28,9 @@ export class KoishiService extends App implements OnModuleInit {
         ctx.plugin(pluginDesc.plugin, pluginDesc.options);
       }
     }
+  }
+
+  onApplicationBootstrap() {
     return this.start();
   }
 }