Update readme for release 521.

README.md

@@ -3,7 +3,7 @@
 D2DX is a Glide-wrapper and mod that makes the classic Diablo II/LoD run well on modern PCs, while honoring the original look and feel of the game.
 Play in a window or in fullscreen, glitch-free, with or without enhancements like widescreen, true high framerate and anti-aliasing.
 
-Version 0.99.519
+Version 0.99.521
 
 ## Features
   - Turns the game into a well behaved DirectX 11 title on Windows 10 (also 7, 8 and 8.1).
@@ -84,6 +84,11 @@ D2DX is free software, but if you enjoy the project and want to buy me a coffee,
 
 ## Recent release history
 
+### 0.99.521
+  - Fix low fps in menu for 1.13d with basemod.
+  - Fix low fps for 1.13c and 1.14 with basemod.
+  - Fix basemod compatibility so that "BypassFPS" can be enabled without ill effects.
+
 ### 0.99.519
   - Unlock FPS in menus. (Known issue: char select screen animates too fast)
   - Add experimental "sleep fix" to reduce microstutter in-game. Can be enabled with -dxtestsleepfix.