slack: fix wrong named function

rhodecode/config/middleware.py

@@ -38,6 +38,7 b' from routes.middleware import RoutesMidd'
 import routes.util
 
 import rhodecode
+import rhodecode.integrations # do not remove this as it registers celery tasks
 from rhodecode.config import patches
 from rhodecode.config.environment import (
     load_environment, load_pyramid_environment)

rhodecode/integrations/types/slack.py

@@ -176,7 +176,7 b' class SlackIntegrationType(IntegrationTy'
         )
         return result
 
-    def format_repo_create_msg(self, data):
+    def format_repo_create_event(self, data):
         return '<{}|{}> ({}) repository created by *{}*'.format(
             data['repo']['url'],
             data['repo']['repo_name'],