Bug fixes and UI Improvements

This update from Apple will improve the functionality of this app. No new features are included.

- Support for iPhone X
- Fixed an issue where tasks added via the CLI would not be appended on a new line

Bug fixes

iOS 11 support:
- Drag & drop tasks from and to other apps, on iPad.
- Add tasks via Siri. Just say "Create a task in Todotxt"!

Bug fixes