Change config file to ignore unused imports in __init__.py

Author: uvchik

.stickler.yml

@@ -4,6 +4,7 @@ linters:
       max-line-length: 79
       select: C,E,F,W,B,B950
       ignore: E203, E501, W503
+      per-file-ignores: __init__.py:F401
     black:
       config: ./pyproject.toml
       fixer: true