Allow creating checklists in posts based on bulleted list.
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WordPress 5.0 and Gutenberg Support:
Use Classic Block and then Visual editor instructions below.
There are plans for Separate Gutenberg block in the future.
Usage in visual editor :
* Create / Edit Post and add classic Visual Editor bulleted list to it. Try to prepare space for it by leaving empty lines before and after.
* Select list in Visual Editor (and empty line above) and click button "Add Checklist".
* Shortcodes [checklist_in_post] [/checklist_in_post] will appear.
* Save.
* If you want to use cookies – check cookie option under plugin settings.
