Drop compat layer for Uninferable

Author: Pierre-Sassoulas

pylint_django/compat.py

@@ -12,16 +12,8 @@
     from astroid.nodes import Function as FunctionDef
     from astroid.nodes import Getattr as Attribute
 
-# pylint 2.04->2.2 : YES was renamed to Uninferable, then YES became deprecated, then was removed
-try:
-    from astroid.bases import YES as Uninferable
-except ImportError:
-    try:
-        from astroid.util import YES as Uninferable
-    except ImportError:
-        from astroid.util import Uninferable
-
 import pylint
+from astroid.util import Uninferable
 
 # pylint before version 2.3 does not support load_configuration() hook.
 LOAD_CONFIGURATION_SUPPORTED = False

pylint_django/utils.py

@@ -3,12 +3,11 @@
 import sys
 
 import astroid
+from astroid import Uninferable
 from astroid.bases import Instance
 from astroid.exceptions import InferenceError
 from astroid.nodes import ClassDef
 
-from pylint_django.compat import Uninferable
-
 PY3 = sys.version_info >= (3, 0)  # TODO: pylint_django doesn't support Py2 any more