Don't derive

Author: Stephane Landelle

api/src/test/java/org/asynchttpclient/async/SimpleAsyncHttpClientTest.java

@@ -219,7 +219,7 @@ public void onBytesReceived(String url, long amount, long current, long total) {
     public void testNullUrl() throws Exception {
         SimpleAsyncHttpClient client = null;
         try {
-            client = new SimpleAsyncHttpClient.Builder().setProviderClass(getProviderClass()).build().derive().build();
+            client = new SimpleAsyncHttpClient.Builder().setProviderClass(getProviderClass()).build();
             assertTrue(true);
         } catch (NullPointerException ex) {
             fail();