Upgrade to checkstyle 5.4
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Key: MCHECKSTYLE-162
URL: https://jira.codehaus.org/browse/MCHECKSTYLE-162
Project: Maven 2.x Checkstyle Plugin
Issue Type: Improvement
Affects Versions: 2.7
Reporter: HuiSheng Xu
Since checkstyle 5.4 has bean released, and current version of
maven-checkstyle-plugin has supported checktyle 5.3. I think it is a good idea
to upgrade checkstyle to 5.4.
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