Ban JUnit 4 imports (#125)

Author: strangelookingnerd

pom.xml

@@ -5,7 +5,7 @@
  <parent>
  <groupId>org.jenkins-ci.plugins</groupId>
  <artifactId>plugin</artifactId>
- <version>5.18</version>
+ <version>5.22</version>
  <relativePath />
  </parent>
 
@@ -39,6 +39,7 @@
  <spotbugs.effort>Max</spotbugs.effort>
  <spotbugs.failOnError>true</spotbugs.failOnError>
  <spotbugs.threshold>Medium</spotbugs.threshold>
+ <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
  </properties>
 
  <dependencyManagement>