Update .flake8

Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <[email protected]>

Author: MaxymVlasov

.flake8

@@ -102,7 +102,7 @@ pytest-parametrize-values-row-type = tuple
 pytest-mark-no-parentheses = true
 
 # wemake-python-styleguide
-show-source = true
-
 # WPS410: "Forbid some module-level variables" -- __all__ is a legitimate use case
-allowed-module-metadata=__all__
+allowed-module-metadata = __all__
+
+show-source = true