MSO1074Z is not detected properly.

[aairabella]

When trying to use the class with a Rigol MSO1074Z, i got this error:

    raise NameError(msg)
NameError: Unknown device identification:
RIGOL TECHNOLOGIES,MSO1074Z,DS1ZC182100884,00.04.04.SP3
If you believe this device should be supported by this package, feel free to contact the maintainer with this information.

I commented the following lines in __init__.py

        """
        if not match:
            msg = "Unknown device identification:\n%s\n" \
                  "If you believe this device should be supported " \
                  "by this package, feel free to contact " \
                  "the maintainer with this information." % idn
            raise NameError(msg)
        """

I'm workig in a new branch in order to add to the class the capability of properly detect the MSO1074Z model.