Update README.md

Author: gkjohnson

README.md

@@ -33,7 +33,7 @@ _More features and capabilities in progress!_
 
 [Area Light Support](https://gkjohnson.github.io/three-gpu-pathtracer/example/bundle/areaLight.html)
 
-[Spot Lights Support](https://gkjohnson.github.io/three-gpu-pathtracer/example/bundle/spotLights.html)
+[Spot Light Support](https://gkjohnson.github.io/three-gpu-pathtracer/example/bundle/spotLights.html)
 
 **Test Scenes**