update typo in README (#68)

* update typo in README

* Update README.md

* add credentials to example config

* add credentials to example config

Author: tomkralidis

README.md

@@ -167,6 +167,9 @@ topics = [
 ]
 
 m = MQTTPubSubClient('mqtt://localhost:1883', options)
+# example with credentials
+# m = MQTTPubSubClient('mqtt://username:password@localhost:1883', options)
+
 m.sub(topics)
 ```
 
@@ -182,7 +185,7 @@ message = create_message(
         content_type='application/x-bufr',
         url='http://www.meteo.xx/stationXYZ-20221111085500.bufr4', 
         identifier='stationXYZ-20221111085500', 
-        datetime=datetime.now(timezone.utc),
+        datetime_=datetime.now(timezone.utc),
         geometry=[33.8, -11.8, 123],
         metadata_id='x-urn:wmo:md:test-foo:htebmal2001',
         wigos_station_identifier='0-20000-12345',

pywis-pubsub-config.yml

@@ -2,6 +2,9 @@
 # RFC1738 URL
 broker: mqtts://localhost:1883
 
+# RFC1738 URL with credentials
+#broker: mqtts://username:password@localhost:1883
+
 # list of topics to subscribe to
 subscribe_topics:
     - '#'