Update README.md

Author: XceedBoucherS

README.md

@@ -281,6 +281,8 @@ A commercial license can be purchased at [Xceed](https://xceed.com).
 
 ## Release history
 
+* **May 18, 2021, released DocX v1.8.0 with [11 bug fixes and improvements](../../wiki/Release-Notes-v1.8.0).**
+* January 25, 2021, released [Xceed Words for .NET](https://xceed.com/xceed-words-for-net) v1.8.0 with [30 bug fixes and improvements](../../wiki/Release-Notes-v1.2.0#Plus180).
 * **September 22, 2020, released DocX v1.7.1 with [19 bug fixes and improvements](../../wiki/Release-Notes-v1.7.1).**
 * August 17, 2020, released [Xceed Words for .NET](https://xceed.com/xceed-words-for-net) v1.7.1 with [28 bug fixes and improvements](../../wiki/Release-Notes-v1.2.0#Plus171).
 * **June 29, 2020, released DocX v1.7.0 with [27 bug fixes and improvements](../../wiki/Release-Notes-v1.7.0).**