Github Flavored Markdown task lists

### Setting

{
        taskList : true
    }

### Examples

- [x] @mentions, #refs, [links](), **formatting**, and <del>tags</del> supported;
- [x] list syntax required (any unordered or ordered list supported);
- [x] this is a complete item;
- [ ] this is an incomplete item [test link](#);
- [ ] this is an incomplete item;
    - [ ] this is an incomplete item [test link](#);
    - [ ] this is an incomplete item [test link](#);
- [x] list syntax required (any unordered or ordered list supported);
- [x] this is a complete item;
- [ ] this is an incomplete item [test link](#);
- [ ] this is an incomplete item;
    - [ ] this is an incomplete item [test link](#);
- [x] list syntax required (any unordered or ordered list supported);
- [x] this is a complete item;
- [ ] this is an incomplete item [test link](#);
- [ ] this is an incomplete item;
    - [ ] this is an incomplete item [test link](#);
    - [ ] this is an incomplete item [test link](#);

> Github Flavored Markdown task lists