Returns the name and version of the current shell

def info(self):
        """Returns the name and version of the current shell"""
        proc = Popen(['zsh', '-c', 'echo $ZSH_VERSION'],
                     stdout=PIPE, stderr=DEVNULL)
        version = proc.stdout.read().decode('utf-8').strip()
        return u'ZSH {}'.format(version)