change port number for user service

Author: wjacobw

backend/user-service/src/app.module.ts

@@ -6,7 +6,7 @@ import { MongooseModule } from '@nestjs/mongoose';
 
 @Module({
   imports: [
-    MongooseModule.forRoot('mongodb://127.0.0.1/cs3219-questionrepo'),
+    MongooseModule.forRoot('mongodb://127.0.0.1/PeerPrep'),
     UsersModule,
   ],
 })