Add patch to the sources

update-warning-config-to-fix-tests-on-python-3.6-nightly.patch

@@ -0,0 +1,14 @@
+diff --git a/tornado/test/runtests.py b/tornado/test/runtests.py
+index 526ae5d..36a841f 100644
+--- a/tornado/test/runtests.py
++++ b/tornado/test/runtests.py
+@@ -124,6 +124,9 @@ def main():
+     # Silence the warning until we can drop 3.5.[01].
+     warnings.filterwarnings("ignore", category=PendingDeprecationWarning,
+                             message=".*legacy __aiter__ protocol")
++    # 3.5.2's PendingDeprecationWarning became a DeprecationWarning in 3.6.
++    warnings.filterwarnings("ignore", category=DeprecationWarning,
++                            message=".*legacy __aiter__ protocol")
+ 
+     logging.getLogger("tornado.access").setLevel(logging.CRITICAL)
+