check verbose flag

src/main/java/GraphDataObjectReader.java

@@ -15,7 +15,7 @@ public class GraphDataObjectReader {
             BufferedInputStream fileIn = new BufferedInputStream(new FileInputStream(filename));
                 ObjectInputStream in = new ObjectInputStream(fileIn))
         {
-            if(verbose) {
+            if (this.verbose) {
                 System.out.println("Reading graph data from file. This may take some time");
                 System.out.println("File I/O time is not included in results");
             }