Update README.md

Author: Swanson-Hysell

README.md

@@ -6,7 +6,7 @@ This repository contains code and data associated with the paper to be submitted
 
 **The Northbrae rhyolite of Berkeley constrains motion of the proto-Hayward Fault**
 
-Wesley G. Henschel<sup>1</sup>, Eben B. Hodgin<sup>1,2</sup>, Nicholas L. Swanson-Hysell<sup>1</sup>
+Wesley G. Henschel<sup>1</sup>, Eben B. Hodgin<sup>1,2</sup>, and Nicholas L. Swanson-Hysell<sup>1</sup>
 
 <sup>1</sup> Department of Earth and Planetary Science, University of California, Berkeley, CA, USA  
 <sup>2</sup> Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912