updated milestone link

README.md

@@ -27,7 +27,7 @@ We are actively looking for testers. So please try the current development versi
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/2224/badge.svg)](https://scan.coverity.com/projects/2224)
 [![Travis Build Status](https://travis-ci.org/MarlinFirmware/Marlin.svg)](https://travis-ci.org/MarlinFirmware/Marlin)
 
-What bugs are we working on: [Bug Fixing Round 2](https://github.com/MarlinFirmware/Marlin/milestones/Bug%20Fixing%20Round%202)
+What bugs are we working on: [Bug Fixing Round 3](https://github.com/MarlinFirmware/Marlin/milestones/Bug%20Fixing%20Round%203)
 
 ## Contact