pandoc/test/command/setext-fenced-div.md

```
% pandoc -t native
::: {.cell}
---
:::
^D
[ Div ( "" , [ "cell" ] , [] ) [ HorizontalRule ] ]
```
Markdown reader: fenced div takes priority over setext header. For ::: {.cell} --- ::: 2019-03-29 01:39:22 +01:00			```
			`% pandoc -t native`
			`::: {.cell}`
			`---`
			`:::`
			`^D`
Switch from pretty-simple to pretty-show for native output. Update tests. Reason: it turns out that the native output generated by pretty-simple isn't always readable by the native reader. According to https://github.com/cdepillabout/pretty-simple/issues/99 it is not a design goal of the library that the rendered values be readable using 'read'. This makes it unsuitable for our purposes. pretty-show is a bit slower and it uses 4-space indents (non-configurable), but it doesn't have this serious drawback. 2021-09-29 06:17:53 +02:00			`[ Div ( "" , [ "cell" ] , [] ) [ HorizontalRule ] ]`
Markdown reader: fenced div takes priority over setext header. For ::: {.cell} --- ::: 2019-03-29 01:39:22 +01:00			```