Downgrade checkstyle version to be compatible with Java 1.7

Tencent / TubeMQ

TubeMQ has been donated to the Apache Software Foundation and renamed to InLong, please visit the new Apache repository: https://github.com/apache/incubator-inlong

https://inlong.apache.org/

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Downgrade checkstyle version to be compatible with Java 1.7 #94

Closed tisonkun closed 5 years ago

tisonkun commented 5 years ago

This closes #73

gosonzhang commented 5 years ago

Thanks!