The option is visible only when you choose the filetype as markdown or your filename ends with .md
* updated for latest changes in gist.github.com design
CHANGES on 2017/04/12
* updates to latest github changes
* Removed the css from loading and breaking http://gist.github.com
* Fixes the issue with appearing multiple preview buttons on multiple markdown files
CHANGES on 2018/01/03
* updates to latest github changes
CHANGES on 2018/01/20
* Support for Github flavoured markdown
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