Changed commited field in transaction class as this was a mistake in …

…the project description for part 1

src/main/java/millions/Transaction.java

@@ -7,7 +7,7 @@ public abstract class Transaction {
   private Share share;
   private int week;
   private TransactionCalculator transactionCalculator;
-  private boolean committed;
+  protected boolean committed;
 
   protected Transaction(Share share, int week, TransactionCalculator transactionCalculator) {
     this.share = share;