Merge pull request #726 from RayTracing/markdeep-v1.11

Update local Markdeep library to v1.11

Author: hollasch

CHANGELOG.md

@@ -3,6 +3,10 @@ Change Log -- Ray Tracing in One Weekend
 
 # v3.2.1 (in progress)
 
+### Common
+  - Fix: Update local Markdeep library (for offline reading) to v1.11. The prior version had
+    incorrect content (#712)
+
 ### _In One Weekend_
   - Delete: Remove premature `cstdlib` include; not needed until we use `rand()` (#687)
   - Fix: Replace old anti-alias result image with before-and-after image (#679)