Maven POM: upgrade JUnit version to 4.13.

Author: carlosame

pom.xml

@@ -22,7 +22,7 @@
 	<dependency>
 		<groupId>junit</groupId>
 		<artifactId>junit</artifactId>
-		<version>4.12</version>
+		<version>4.13</version>
 		<type>jar</type>
 		<scope>test</scope>
 		<optional>false</optional>