Global VSCode lint config

Steps to lint with StandardJS in VSCode:

1. Install [JavaScript Standard Style](https://marketplace.visualstudio.com/items?itemName=chenxsan.vscode-standardjs) extension in VSCode.
2. Install `standard` and `eslint-plugin-html@3.2.2` globally.
3. Config VSCode global setting as follow:

``` json
{
"standard.validate": [
"javascript",
"javascriptreact",
"html"
],
"standard.options": {
"plugins": ["html"]
},
"files.associations": {
"*.vue": "html"
}
}
```

This works for all projects by default.

Edit: use `standard@latest` and `eslint-plugin-html@latest` is fine for now. This config will lose Vetur IntelliSense, still seeking for better config.