[438484] Fix "protocol" not being used in publish.single()

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=438484
Change-Id: I0b989335d3aad580b53222388252c6ffcc0a3899

ChangeLog.txt

+v1.0.2
+======
+
+- Fix "protocol" not being used in publish.single()
+
 v1.0.1
 ======
 

src/paho/mqtt/publish.py

@@ -213,5 +213,5 @@ def single(topic, payload=None, qos=0, retain=False, hostname="localhost",
     """
 
     msg = {'topic':topic, 'payload':payload, 'qos':qos, 'retain':retain}
-    multiple([msg], hostname, port, client_id, keepalive, will, auth, tls)
+    multiple([msg], hostname, port, client_id, keepalive, will, auth, tls, protocol)