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fix electerm#1794 [fix] Fix window release(Mac, Linux user do not nee…

…d upgrad)

[skip appveyor]

fix electerm#1762 [fix] Fix click new bookmark function

fix electerm#1759 [feat] Add env:LANG option in bookmark form-> setti…

…ng (electerm#1760)

fix electerm#1755 [fix] Handle readfile error in sftp(ignore bad link) (

electerm#1756)

Adjust background image settings UI (electerm#1749)

Improve maximize function

Bump websocket-extensions from 0.1.3 to 0.1.4 (electerm#1730)

Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-node) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/faye/websocket-extensions-node/releases)
- [Changelog](https://github.com/faye/websocket-extensions-node/blob/master/CHANGELOG.md)
- [Commits](faye/websocket-extensions-node@0.1.3...0.1.4)

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