qmk_firmware/keyboards/boston_meetup/2019/info.json

{
    "usb": {
        "device_version": "20.1.9"
    },
    "encoder": {
        "rotary": [
            {"pin_a": "B13", "pin_b": "B14"}
        ]
    },
    "processor": "STM32F303",
    "bootloader": "stm32-dfu",
    "board": "QMK_PROTON_C",
    "debounce": 6
}