Update the pulsar citation for the new version of the tech report.

Summary: See title.

Reviewed By: theschnitz

Differential Revision: D25785775

fbshipit-source-id: 6b2ab6ea8a02a7dd1742a214e48caab35a44528c

README.md

@@ -118,8 +118,8 @@ If you are using the pulsar backend for sphere-rendering (the `PulsarPointRender
 
 ```bibtex
 @article{lassner2020pulsar,
-    author = {Christoph Lassner},
-    title = {Fast Differentiable Raycasting for Neural Rendering using Sphere-based Representations},
+    author = {Christoph Lassner and Michael Zollh\"ofer},
+    title = {Pulsar: Efficient Sphere-based Neural Rendering},
     journal = {arXiv:2004.07484},
     year = {2020},
 }