Returns the changed lines in a diff.

        - Potentially this is vc specific (if not using udiff).

        Note: this returns the line numbers in descending order.

def modified_lines_from_diff(self, diff):
        """Returns the changed lines in a diff.

        - Potentially this is vc specific (if not using udiff).

        Note: this returns the line numbers in descending order.

        """
        from pep8radius.diff import modified_lines_from_udiff
        for start, end in modified_lines_from_udiff(diff):
            yield start, end