fix wrong class to be tested in test

src/test/java/de/uni_hamburg/corpora/validation/ExbMergerTest.java

@@ -71,7 +71,7 @@ public class ExbMergerTest {
     @Test
     public void testGetIsUsableFor() {
         System.out.println("getIsUsableFor");
-        IAAFunctionality instance = new IAAFunctionality();
+        ExbMerger instance = new ExbMerger();
         //Collection<Class> expResult = null;
         //Collection<Class> result = instance.getIsUsableFor();
         Collection<Class<? extends CorpusData>> result = instance.getIsUsableFor();