add type declaration to the port parameter of the irc module. #AnsibleZH (#2349)

notification/irc.py

@@ -247,7 +247,7 @@ def main():
     module = AnsibleModule(
         argument_spec=dict(
             server=dict(default='localhost'),
-            port=dict(default=6667),
+            port=dict(type='int', default=6667),
             nick=dict(default='ansible'),
             nick_to=dict(required=False, type='list'),
             msg=dict(required=True),