False-negative pylint result on py3.4

Signed-off-by: Aleksei Stepanov <penguinolog@gmail.com>

Author: penguinolog

exec_helpers/metaclasses.py

@@ -57,7 +57,7 @@ def __init__(cls, name: str, bases: typing.Tuple[type, ...], namespace: typing.D
         super(SingleLock, cls).__init__(name, bases, namespace)
         cls.__lock = threading.RLock()
 
-    def __new__(
+    def __new__(  # pylint: disable=arguments-differ
         mcs: typing.Type["SingleLock"],
         name: str,
         bases: typing.Tuple[type, ...],