Use secure random

jplag.cli/src/main/java/de/jplag/CLI.java

@@ -2,6 +2,7 @@ package de.jplag;
 
 import static de.jplag.CommandLineArgument.*;
 
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
@@ -36,7 +37,7 @@ public final class CLI {
 
     private static final Logger logger = LoggerFactory.getLogger(CLI.class);
 
-    private static final Random RANDOM = new Random();
+    private static final Random RANDOM = new SecureRandom();
 
     private static final String CREDITS = "Created by IPD Tichy, Guido Malpohl, and others. JPlag logo designed by Sandro Koch. Currently maintained by Sebastian Hahner and Timur Saglam.";