Update README.md

README.md

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-What bugs are we working on: [Bug Fixing Round 3](https://github.com/MarlinFirmware/Marlin/milestones/Bug%20Fixing%20Round%203)
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 ## Contact
 
 __IRC:__ #marlin-firmware @freenode ([WebChat Client](https://webchat.freenode.net/?channels=marlin-firmware)