New features:
1. Revamp Rich Text Editor
- Scroll toolbar horizontally to see more buttons
- Easier to change font name, font size and color
- Easier to align text
- Insert Heading (H1, H2, H3, H4, H5, H6)
- Go to next or previous paragraph element without leaving editor
- Tap save button to save the content without leaving editor
2. Revamp Title Editor, LaTeX Editor and Cover Text Editor's toolbar like Rich Text Editor's toolbar
3. Customize title in Table of Contents
4. Support OpenDyslexic Font
5. Optimized for iPhone XS, XS Max and XR
6. Bug fix
