[BUG] Can't work well when the text > 400KB

[hongchengjian]

{"message":"This API renders Markdown text up to 400 KB in size. The requested text is too large to render via the API.","errors":[{"resource":"Markdown","field":"data","code":"too_large"}],"documentation_url":"https://docs.github.com/v3/markdown/"}

[yansheng836]

As the tip suggests, the article is too long.

400KB，400 * 1024 = 409 600 letters.

Maybe you should split it into two files.