loongson/pypi: links for bootable-usb

loongson/mirror bootable-usb-0.4.tar.gz
loongson/mirror bootable-usb-0.3.1.tar.gz
loongson/mirror bootable-usb-0.3.tar.gz
loongson/mirror bootable-usb-0.2.tar.gz
loongson/mirror bootable-usb-0.1.tar.gz