chore: additional mdx fix (#541)

blog/july-2016-roundup.md

@@ -36,7 +36,6 @@ If you've made an Electron app or host a meetup, make a [pull request](https://g
 
 ### New Meetups
 
-{: .table .table-ruled .table-full-width .table-with-spacious-first-column .mb-7}
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 | [Electron Open Source Desktop Framework](http://www.meetup.com/Electron-Open-Source-Desktop-Framework/) | London, UK |