Fixed broken test caused by new getRepositoryArchive() methods.

Author: gmessner

src/test/java/org/gitlab4j/api/TestRepositoryApi.java

@@ -164,7 +164,7 @@ public void testRepositoryArchiveViaFile() throws GitLabApiException, IOExceptio
         Project project = gitLabApi.getProjectApi().getProject(TEST_NAMESPACE, TEST_PROJECT_NAME);
         assertNotNull(project);
 
-        File file = gitLabApi.getRepositoryApi().getRepositoryArchive(project.getId(), "master", null);
+        File file = gitLabApi.getRepositoryApi().getRepositoryArchive(project.getId(), "master", (File)null);
         assertTrue(file.length() > 0);
         file.delete();