Headers don' t renders

Hi Using this js script

```
var markdownpdf = require("markdown-pdf")
, fs = require("fs")
markdownpdf().from("health check.md").to("testdocument.pdf", function () {
console.log("Done")
})
```

When i use it to render my page for example

`#test`
`##test2`
So dosent the pdf that is the scripts output render them as headers it just renders the plaintext, is it something i have doned wrong?