add workflow to create release for macOS

fix release script

following the change of electron-pacakger

bump up version to 1.2.0

exclude test directory from npm package

bump up version to 1.1.1

add test for the case where Electron binary is directly executed

bump up version to 1.0.4

bump up version to 1.0.0

- [x] task list in markdown
- Add tooltips to links
- Search text in the document
- Outline window
- User CSS and favorite code theme
- Math formula preview with [katex](https://github.com/Khan/KaTeX) (please use `katex` code block)
- [mermaid.js](https://github.com/ludwick/reveal.js-mermaid-plugin) integration (please use `mermaid` code block)
- Hidden title bar on OS X
- Many more configurations

- Improve rendering performance (2x faster)
- Optimize app start up time (mermaid, lint result window setup, and so on)
- Update Electron to 0.37
- Use native dialog to choose a file or directory
- Add more tests
- Many refactorings

- Replace :emoji: only in text
- Fix document layout for print
- Fix many bugs

bump up version to 0.10.1

- Outline window feature
- Rotate icon on update
- Fix app title
- New 'About This App' window

bump up version to 0.9.0

- Move menu from right to left
- 'hide_title_bar' customization on OS X
- Add tooltip to links
- Refactorings (link handling with `marked` customized renderer)
- Many tiny improvements