Upgrade `marked` to `0.4.0`

[meowtec]

https://github.com/markedjs/marked/releases/tag/0.4.0

I am writing some doc with markdown-loader, and the markdown below both got wrong result:

| name | type |
| --- | --- |
| key | `string\|number` |

It should be like:

name	type
key	string|number

v0.4.0 fix it, please upgrade.