Fix NUMBER parsing for numbers more than single digit :-)

[HarryKodden]

I stumbled on this during my own application stress testing, these queries where failing...
(age := 30)
PS. Filter is my AST geared Parser

    def test_numeric_operators(self):
        # Greater than
        filter_obj = Filter('age gt 20')
        assert filter_obj.match(self.user) is True

        # Greater than or equal
        filter_obj = Filter('age ge 30')
        assert filter_obj.match(self.user) is True

        # Less than
        filter_obj = Filter('age lt 40')
        assert filter_obj.match(self.user) is True

        # Less than or equal
        filter_obj = Filter('age le 30')
        assert filter_obj.match(self.user) is True