Highlight inside markdown fenced code block

[outofsyncme]

Would like to see highlighted go template inside fenced code block in a markdown file.

For example, in a test.md file:

```go-html-template
  <title>
    {{- if .IsHome }}
      {{- $.Site.Title }}
    {{ else }}
       Not home toto
    {{ end -}}
  </title>
```

[jinliming2]

Hi, I just published v0.2.0 to support Markdown, have a try.