Add v1.2.1 release notes

Add a new release notes

Author: vviau

README.md

@@ -31,7 +31,8 @@ To view more information about **Arc** and **download** the latest version, go t
 1. Click on **Submit new issue**.
 
 ## Release Notes
- 
+
+* [v1.2.1 - 29th of October 2018](releases/v1.2.1.md) 
 * [v1.2.0 - 23rd of October 2018](releases/v1.2.0.md) 
 * [v1.1.3 - 2nd of October 2018](releases/v1.1.3.md) 
 * [v1.1.2 - 24th of September 2018](releases/v1.1.2.md)