Grab package version

def version(self):
        """Grab package version
        """
        for line in self.SLACKBUILDS_TXT.splitlines():
            if line.startswith(self.line_name):
                sbo_name = line[17:].strip()
            if line.startswith(self.line_ver):
                if sbo_name == self.name:
                    return line[20:].strip()