### Fix warnings on Android (#586 by @robsmith11)

Vim Vixen works on Firefox for Android (experimental).
This change suppresses some warnings occurs only on Android.

### Add "repeat last operation" command

Add `repeat.last` command by <kbd>.</kbd> key in default. It repeats last
manipulation command such as opening, updating and deleting a tab. To enabled
this for current users, please add the following keymap into your json:

```json
".": { "type": "repeat.last" }
```

### Show yanked url

Instead of `Current url yanked` show `Yanked https://current-website.com/`.

### Support blacklist with port

Support to specify port to the blacklist, such as `127.0.0.1:8080`.

### Fix Content-Security-Policy issues

Vim Vixen was broke on some sites because of [Content Security Policy (CSP)](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP). The CSP prevents untrusted contents by blocking inline `<style>` tags on the document. Now an issue on Vim Vixen on CSP-enabled sites are fixed.

### Make smooth-scroll smoother (#536)

Make smooth-scroll more smoother. To enable smooth-scroll, type `set smoothscroll` or add `smoothscroll: true` into your settings.

### Space key map (#537)

Allow to enable keymap <kbd>Space</kbd> key:

```json
"keymaps": {
"<Space>": { "type": "follow.start", "newTab": false },
"<C-Space>": { "type": "follow.start", "newTab": true, "background": false }
}
```

### Scroll console (#538)

Limits number of shown item on console completion. The hidden items

### Update README.md (#543 by @ryanstreur)
### Correct spelling of WebExtensions (#535 by @sleepypikachu)
### Update documents (#552 by @TeepaBlue)

### Use browser.runtime.onInstalled event (#539)
### Refactor background (#544)

see also: https://github.com/ueokande/vim-vixen/releases

### Add close tabs to the right command
Close tabs to the right by `Shift+D`. For current users, add the following keymaps into your configuration.

```
`"D": { "type": "tabs.close.right" },`
```

### Open homepage
Add key bindings to open homepage by `gh` and `gH`. `gh` opens homepage in current page, and `gH` opens homepage as new tabs.
For current users, add the following keymaps into your configuration.

```
"gh": { "type": "page.home" },
"gH": { "type": "page.home", "newTab": true },
```


For more details, see also release note:
https://github.com/ueokande/vim-vixen/releases/tag/0.20