Add Newsletters category with Hakanai Broadcast

https://broadcast.hakanai.io/

Author: hlassiege

README.md

@@ -47,6 +47,7 @@
   - [Database](#database)
   - [File management](#file-management)
   - [Automation](#automation)
+  - [Newsletters](#newsletters)
 - [Serverless](#serverless)
 - [Videos](#videos)
 - [Tutorials / Articles](#tutorials--articles)
@@ -216,6 +217,10 @@ _For a more complete list see [StaticGen](https://www.staticgen.com/)._
 - [Zapier](https://zapier.com/) - Trigger actions connecting more than 1000 apps together.
 - [DataFire](https://github.com/DataFire/DataFire) - DataFire is an open source framework for building and integrating APIs.
 
+### Newsletters
+
+- [Hakanai Broadcast](https://broadcast.hakanai.io/) - Turns your site's RSS feed into an email newsletter and auto-posts new content to social networks.
+
 ## Serverless
 
 - [Netlify Functions](https://www.netlify.com/docs/functions/) - Netlify lets you deploy Lambda functions without an AWS account, and with function management handled directly within Netlify.