[O] Indicate programming language on babel export to markdown.

[Konstantin]

GitHub support programming language highlight for markdown:

```lisp
(some-code)
```

When I use org-md-export-to-markdown for such org snippet

#+begin_src emacs-lisp
(some-code)
#+end_src

babel is not indicate `emacs-lisp` in the resulting markdown file.
Is it possible? How to achieve that?

-- 
Kostafey <address@hidden>