Fix bad version for v3.2.1

Author: hollasch

books/RayTracingTheRestOfYourLife.html

@@ -2594,8 +2594,8 @@
   - **Title (book)**: “Ray Tracing: The Rest of Your Life”
   - **Author**: Peter Shirley
   - **Editors**: Steve Hollasch, Trevor David Black
-  - **Version/Edition**: v3.2.0
-  - **Date**: 2020-07-18
+  - **Version/Edition**: v3.2.1
+  - **Date**: 2020-10-03
   - **URL (series)**: https://raytracing.github.io/
   - **URL (book)**: https://raytracing.github.io/books/RayTracingTheRestOfYourLife.html