Add Twitter badge

Author: marcusolsson

README.md

@@ -5,6 +5,7 @@
 [![Marketplace](https://img.shields.io/badge/dynamic/json?color=orange&label=marketplace&prefix=v&query=%24.items%5B%3F%28%40.slug%20%3D%3D%20%22marcusolsson-json-datasource%22%29%5D.version&url=https%3A%2F%2Fgrafana.com%2Fapi%2Fplugins)](https://grafana.com/grafana/plugins/marcusolsson-json-datasource)
 [![Downloads](https://img.shields.io/badge/dynamic/json?color=orange&label=downloads&query=%24.items%5B%3F%28%40.slug%20%3D%3D%20%22marcusolsson-json-datasource%22%29%5D.downloads&url=https%3A%2F%2Fgrafana.com%2Fapi%2Fplugins)](https://grafana.com/grafana/plugins/marcusolsson-json-datasource)
 [![License](https://img.shields.io/github/license/marcusolsson/grafana-json-datasource)](LICENSE)
+[![Twitter](https://img.shields.io/twitter/follow/marcusolsson?color=%231DA1F2&label=twitter&style=plastic)](https://twitter.com/marcusolsson)
 
 A data source plugin for loading JSON APIs into [Grafana](https://grafana.com).