Change xrange to range (#601)

tests/test_http.py

diff --git a/tests/test_http.py b/tests/test_http.py
index 3e23ed4..6c2748b 100644
--- a/tests/test_http.py
+++ b/tests/test_http.py
@@ -1196,7 +1196,7 @@
     from googleapiclient.http import MAX_BATCH_LIMIT
 
     batch = BatchHttpRequest()
-    for i in xrange(0, MAX_BATCH_LIMIT):
+    for i in range(0, MAX_BATCH_LIMIT):
       batch.add(HttpRequest(
         None,
         None,