Update class name

Author: timKraeuter

src/test/java/no/hvl/dat250/jpa/tutorial/creditcards/driver/MainTest.java renamed to src/test/java/no/hvl/dat250/jpa/tutorial/creditcards/driver/CreditCardsMainTest.java

@@ -14,7 +14,7 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 
-public class MainTest {
+public class CreditCardsMainTest {
 
  private EntityManagerFactory factory;