Fix: Added = to define a public attribute in class _ComplexityCounter…

…(object). Issue #14

wemake_python_styleguide/visitors/ast/complexity/function.py

@@ -64,7 +64,7 @@ def __init__(self) -> None:
         self.variables: DefaultDict[AnyFunctionDef, List[str]] = defaultdict(
             list,
         )
-        self._exit_metrics: _ComplexityExitMetrics()
+        self._exit_metrics = _ComplexityExitMetrics()
 
     def check_arguments_count(self, node: AnyFunctionDefAndLambda) -> None:
         """Checks the number of the arguments in a function."""