Update README.md

Author: jackparmer

README.md

@@ -3,7 +3,7 @@
 [![npm version](https://badge.fury.io/js/plotly.js.svg)](https://badge.fury.io/js/plotly.js)
 [![circle ci](https://circleci.com/gh/plotly/plotly.js.png?&style=shield&circle-token=1f42a03b242bd969756fc3e53ede204af9b507c0)](https://circleci.com/gh/plotly/plotly.js)
 
-## Announcement! 📢 Spots are still available for a 2 day, Plotly.js master class in NYC, November 16-17. [Registration here](https://plotcon.plot.ly/workshops) 🎨 📈 🗽
+#### Announcement! 📢 Spots are still available for a 2 day, Plotly.js master class in NYC, November 16-17. [Registration here](https://plotcon.plot.ly/workshops) 🎨 📈 🗽
 
 Built on top of [d3.js](http://d3js.org/) and [stack.gl](http://stack.gl/),
 plotly.js is a high-level, declarative charting library. plotly.js ships with over 20