use easywebpack cli to initialize a application which use egg@2.19.1 , start node server by npm run dev, all static resouces 404
## What happens?
egg 2.19.1 use easywebpack cli init application , start node server by npm run dev, all static resouces 404
![image](https://user-images.githubusercontent.com/7248432/98078915-f0058080-1ead-11eb-9f58-e53875641d6a.png)

## Mini Showcase Repository(REQUIRED)
> Provide a mini GitHub repository which can reproduce the issue.
> Use `npm init egg --type=simple bug` then upload to your GitHub

<!-- https://github.com/YOUR_REPOSITORY_URL -->

## How To Reproduce

**Steps to reproduce the behavior:**
1. npm i @easy-team/easywebpack-cli -g
2. init Egg + Vue + TypeScript Server Side Render Application (application name: demo)
easy init  
![image](https://user-images.githubusercontent.com/7248432/98068577-634fc800-1e97-11eb-848c-630424b36b93.png)
3. cd demo
npm install
4. npm run dev

**Expected behavior**
1.  all static resources requests  are responded by 200 status

## Context
- **Node Version**: v12.6.0
- **Egg Version**: 2.19.1
- **Plugin Name**:
- **Plugin Version**:
- **Platform**: mac
