Update README.md

README.md

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 Current Status: Bug Fixing
 ===================
 
-What bugs are we working on: https://github.com/MarlinFirmware/Development/milestones/Bug%20Fixing%20Round%201
+What bugs are we working on: https://github.com/MarlinFirmware/Marlin/milestones/Bug%20Fixing%20Round%201
 
 IRC channel on freenode: #marlin-firmware