Update README.md with "maintained by community" badge

Author: gvwilson

README.md

@@ -9,11 +9,10 @@
 
 <div align="center">
   <a href="https://dash.plotly.com/project-maintenance">
-    <img src="/https://dash.plotly.com/assets/images/maintained-by-plotly.png" width="400px" alt="Maintained by Plotly">
+    <img src="/https://dash.plotly.com/assets/images/maintained-by-community.png" width="600px" alt="Maintained by the Plotly Community">
   </a>
 </div>
 
-
 ### Table of contents 
 
 - [What is Plotly.NET?](#what-is-plotlynet)