markdown option drops "%"

[K4zuki]

Condition

• pantable == 0.12.2
• python == 3.5

Issue

following syntax drops single % character in cell

```table
---
markdown: True
---
This,is,a table,%
%,%,%,%
```

This will look like

This	is	a table
			%

---

Do we have option to bypass this?

[ickc]

In (at least pandoc's) markdown, % has to be escaped (and I personally got encountered this mistakes from time to time.) i.e. write them as \%.

I bet if you use markdown: False then this won't be a problem.

Then the next question is if there should be an option to "intelligently" fix this common markdown mistakes in pandoc. I don't think it should, because as long as markdown: True then the cells should conform to (pandoc's) markdown spec so I don't think exceptional case should be made in this case.