loongson/pypi: links for openopc-python3x

loongson/mirror OpenOPC-Python3x-1.3.1.tar.gz
loongson/mirror OpenOPC-Python3x-1.2.2.tar.gz
loongson/mirror OpenOPC_Python3x-1.2.2-py3.6.egg
loongson/mirror OpenOPC-Python3x-1.2.1.tar.gz
loongson/mirror OpenOPC_Python3x-1.2.1-py3.6.egg