Update readme

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/ResultStatistic.java

@@ -116,7 +116,7 @@ public class ResultStatistic {
 
     @Override
     public String toString() {
-        String sb = "ResultStatistic[" + "filesTotal=" + filesTotal +
+        return "ResultStatistic[" + "filesTotal=" + filesTotal +
                 ", excluded=" + excluded +
                 ", shouldChange=" + shouldChange +
                 " (failedChanging=" + failedChanging +
@@ -126,6 +126,5 @@ public class ResultStatistic {
                 ", failed=" + failed +
                 ", runtime=" + formatTimer() +
                 ']';
-        return sb;
     }
 }