Add missing extended_nickname_format setting to the default config

CHANGELOG.md

@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 - Mastodon API: Fix private and direct statuses not being filtered out from the public timeline for an authenticated user (`GET /api/v1/timelines/public`)
+- Added `:instance, extended_nickname_format` setting to the default config
 
 ## [1.1.0] - 2019-??-??
 ### Security

config/config.exs

@@ -279,7 +279,8 @@ config :pleroma, :instance,
   max_remote_account_fields: 20,
   account_field_name_length: 512,
   account_field_value_length: 2048,
-  external_user_synchronization: true
+  external_user_synchronization: true,
+  extended_nickname_format: false
 
 config :pleroma, :markup,
   # XXX - unfortunately, inline images must be enabled by default right now, because