Update README.md

Author: XceedBoucherS

README.md

@@ -8,6 +8,8 @@ Starting at v4.0.0, this free toolkit is provided under the [Xceed Community Lic
 
 ## Latest news
 
+**December 2, 2021** v4.2.0 released with [18 bug fixes and improvements](../../wiki/Improvements-in-v4.2.0). 
+
 **May 18, 2021** v4.1.0 released with [20 bug fixes and improvements](../../wiki/Improvements-in-v4.1.0). 
 
 *January 25, 2021* v4.1.0 of the [Plus Edition](../../wiki/Xceed-Toolkit-Plus-for-WPF) released with [27 bug fixes and improvements](../../wiki/Improvements-in-v3.5.0#Plus410)