Remove redundant Exception from throws list in DragonSlayerTest

Author: hoangNam

strategy/src/test/java/com/iluwatar/strategy/DragonSlayerTest.java

@@ -52,7 +52,7 @@ public void testGoToBattle() {
    * Verify if the dragon slayer uses the new strategy during battle after a change of strategy
    */
   @Test
-  public void testChangeStrategy() throws Exception {
+  public void testChangeStrategy() {
     final DragonSlayingStrategy initialStrategy = mock(DragonSlayingStrategy.class);
     final DragonSlayer dragonSlayer = new DragonSlayer(initialStrategy);