Checkstyle Sonar plugin 3.5.1

[Roman Ivanov]

Short description of the version: 

Issue #63: upgrade to checkstyle 7.5.1

SQ versions compatibility: 5.6.4

JDK: 1.8

Change log URL: https://github.com/checkstyle/sonar-checkstyle/releases/tag/3.5.1

Download URL: https://github.com/checkstyle/sonar-checkstyle/releases/download/3.5.1/checkstyle-sonar-plugin-3.5.1.jar