1.8.1 changelog updated

Author: Luna5ama

changelogs/1.8.1.md

@@ -5,11 +5,12 @@
 - Added Color McSpaceFace colorspace for rendering
 
 ## Improvement
-- Improved PCSS
-- Improved Water Caustics and make it enabled by default
+- **Improved Water Caustics and make it enabled by default**
+- **Improved PCSS**
 - Improved denoiser to reduce fireflies
 - Increased environment probe range setting maximum
 - Adjusted water wave
+- Improved shadesmith tilling algorithm to reduce VRAM usage
 
 ## Fix
 - Fixed potential cloud banding caused by bad randoms