how to update qmk

updating qmk (vial qmk)

1. download new vial version from here
2. git pull in vial-qmk
3. update QMK-MSYS from here
4. check home config in QMK-MSYS with qmk config user.qmk_home, should be vial-qmk. update if needed with this command
5. qmk setup in qmk-msys