docs: add newsletter badge
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		| @@ -14,7 +14,8 @@ | ||||
| [](https://sonarcloud.io/dashboard?id=wiki) | ||||
| [](http://standardjs.com/)   | ||||
| [](https://gitter.im/Requarks/wiki) | ||||
| [](https://twitter.com/requarks) | ||||
| [](https://twitter.com/requarks) | ||||
| [](https://wiki.requarks.io/newsletter) | ||||
|  | ||||
| ##### A modern, lightweight and powerful wiki app built on NodeJS | ||||
|  | ||||
|   | ||||
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