📝 Add dialog deprecation warning

Author: germanattanasio

watson_developer_cloud/dialog_v1.py

@@ -27,6 +27,7 @@ class DialogV1(WatsonDeveloperCloudService):
 
     def __init__(self, url=default_url, **kwargs):
         WatsonDeveloperCloudService.__init__(self, 'dialog', url, **kwargs)
+        print('WARNING: The Dialog service was deprecated, existing instances of the service will continue to function until August 9, 2017. See https://www.ibm.com/watson/developercloud/doc/conversation/migration.shtml')
 
     def get_dialogs(self):
         return self.request(method='GET', url='/v1/dialogs', accept_json=True)