Using items can bug the heading sections

[RodrigoBertotti]

Hi :)
I will show an example of the problem:

 ### `TEXT 1` 

 - item 1
 
 ### `TEXT 2 ...`
 
 TEXT 2.1 ...

Problem in the result:

<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->


- [`TEXT 1`](#text-1)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->

the problem doesn't occur when I remove the - character before item 1:

 ### `TEXT 1` 

 item 1
 
 ### `TEXT 2 ...`
 
 TEXT 2.1 ...

Correct result:

<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->


- [`TEXT 1`](#text-1)
- [`TEXT 2 ...`](#text-2-)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->

using others characters * / + shows the same error

all the best
- Rodrigo