Comments in code are converted to headings

[kmalfroid]

The following markdown:

# test.md

```python
# comment
import somelibrary
```

is converted to the following JIRA:

h1. test.md

{code:python}
h1. comment
import somelibrary
{code}

I expect the following result:

h1. test.md

{code:python}
# comment
import somelibrary
{code}