Remove all IAstroidChecker

Author: Matej Spiller Muys

pylint_django/checkers/migrations.py

@@ -9,7 +9,7 @@
 """
 
 import astroid
-from pylint import checkers, interfaces
+from pylint import checkers
 from pylint_plugin_utils import suppress_message
 
 from pylint_django import compat
@@ -51,8 +51,6 @@ class NewDbFieldWithDefaultChecker(checkers.BaseChecker):
     desired default values.
     """
 
-    __implements__ = (interfaces.IAstroidChecker,)
-
     # configuration section name
     name = "new-db-field-with-default"
     msgs = {
@@ -113,8 +111,6 @@ def _path(node):
 
 
 class MissingBackwardsMigrationChecker(checkers.BaseChecker):
-    __implements__ = (interfaces.IAstroidChecker,)
-
     name = "missing-backwards-migration-callable"
 
     msgs = {