Update README.md

DiligentGraphics · web-flow · commit 955d18ba5dd4 · 2018-01-15T21:18:49.000-08:00
diff --git a/README.md b/README.md
@@ -577,6 +577,7 @@ objects. Refer to the following pages for more information:
 ## v2.1.b
 
 * Removed legacy Visual Studio solution and project files
+* Added API reference
 
 ## v2.1.a
 
