Remove needless Exception from method signature

Fixes https://github.com/winterchord/xjava/commit/d09fb713d19abbcbdaaa979adb59aa7fc94532fd#commitcomment-14962172

The original PR (https://github.com/exercism/xjava/pull/69) that this issue
could have been fixed in was merged before I could fix this issue.

hello-world/src/test/java/HelloWorldTest.java

@@ -16,7 +16,7 @@ public class HelloWorldTest {
     }
 
     @Test
-    public void helloAnotherSampleName() throws Exception {
+    public void helloAnotherSampleName() {
         assertEquals("Hello, Bob!", HelloWorld.hello("Bob"));
     }
 }