Upgrade to JUnit 4.12

Release notes:

https://github.com/junit-team/junit/blob/master/doc/ReleaseNotes4.12.md

pom.xml

@@ -186,7 +186,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.11</version>
+      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>