update junit from 4.12 -> 4.13 (test dependency)

Author: TheSnoozer

maven/pom.xml

@@ -32,7 +32,7 @@
     <maven-plugin-api.version>3.0</maven-plugin-api.version>
     <maven-plugin-plugin.version>3.6.0</maven-plugin-plugin.version>
 
-    <junit.version>4.12</junit.version>
+    <junit.version>4.13</junit.version>
     <mockito.version>3.1.0</mockito.version>
 
     <fest-assert.version>1.4</fest-assert.version>