fix : Not an ISO 8859-1 character

[jianhaiqing]

What is the purpose of the change

fix https://github.com/apache/rocketmq-exporter/issues/56 XXXXX

Brief changelog

support Chinese consumer group XX

Verifying this change

XXXX

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[zhihui921016]

您好，您的邮件我已经收到。

[jianhaiqing]

@zhihui921016 有什么建议吗？

[zhihui921016]

您好，您的邮件我已经收到。