Do not remove sub bullets

[nhdhung]

Thanks for the nice plugin @lynchjames.

Personally I prefer using "Day Planner" with the following setup so that I can re-schedule my tasks easily in case of some unexpected events (by moving lines up and down with some hotkeys)

# Day Planner

**Current Task**
- [ ] 08:00 - Morning tasks
	- [ ] Workout
	- [ ] Daily note
		- Some random note
		- Some random ideas
		- Some random ideas

> ||08:00||->->->->->->->->->->_ _ _ _ _ _ _ _ ||09:00||

- [ ] 09:00 - Work
        - [ ] Standup
	- [ ] Plan the day
- [ ] 10:00 - Task 1
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Thus, is it possible to keep lines with sub bullets in a future release? Thanks.

[lynchjames]

These should be supported in 0.3.3.