Merge pull request #211 from plotly/gvwilson-patch-1

Update README.md with "community maintained" badge

Author: ndrezn

README.md

@@ -29,6 +29,12 @@
   </h4>
 </div>
 
+<div align="center">
+  <a href="https://dash.plotly.com/project-maintenance">
+    <img src="https://dash.plotly.com/assets/images/maintained-by-community.png" width="400px" alt="Maintained by the Plotly Community">
+  </a>
+</div>
+
 # Table of Contents
 
 * [Introduction](#introduction)