readme中的build徽章的链接写的不对，应为travis集成历史的那一页，而不应该是github项目

### Description

点击项目readme的build徽章，发现进入的还是github，而不是集成记录，感觉这个徽章不是真实的。不能让用户信任你是构建成功的。

### Steps to reproduce

1. 最Github找到项目首页
2.点击readme的build徽章

**Expected behavior:** 跳转到项目的集成历史页

**Actual behavior:** 仍然为当前页

**Link to an example:** [If you're reporting a bug that's not reproducible, please try to reproduce it on [JSFiddle](https://jsfiddle.net/), [JS Bin](https://jsbin.com), [CodePen](http://codepen.io/) or a similar service and paste a link here]

### Plugin configration

for example:

```javascript
new SkeletonPlugin({
pathname: path.resolve(__dirname, `./src`),
port: '7890',
loading: 'spin',
svg: {
color: '#EFEFEF',
shape: 'circle',
shapeOpposite: ['.red']
},
image: {
shape: 'rect', // `rect` | `circle`
color: '#EFEFEF',
shapeOpposite: ['.white']
},
pseudo: {
color: '#EFEFEF', // or transparent
shape: 'circle', // circle | rect
shapeOpposite: ['.apple', '.pen']
},
button: {
color: '#EFEFEF',
excludes: ['.center a']
},
defer: 5000,
excludes: [],
remove: [],
hide: ['.ag-text', '.ag-image'],
grayBlock: ['#header'],
cssUnit: 'vw',
cookies: [{
name: 'SID',
value: 'xxxxxx',
url: 'https://xx.xxx.xx'
}, {
name: 'USERID',
value: 'xxxxxx',
url: 'https://xx.xxx.xx'
}]
})
```

### Versions

- Page Skeleton:
- Webpack: