Fix YAML outpput ending.

Author: J08nY

common/src/main/java/cz/crcs/ectester/common/output/BaseYAMLTestWriter.java

@@ -125,6 +125,6 @@ public void end() {
         String out = yaml.dump(result);
 
         output.println(out);
-        output.println("---");
+        output.println("...");
     }
 }