feat: add re-identification metric

Author: judithspd

pycanon/utility/_reidentification_metrics.py

@@ -34,5 +34,5 @@ def average_rir(
     :type quasi_ident: list of strings
     """
     equiv_class = aux_anonymity.get_equiv_class(data_anon, quasi_ident)
-    avg_rir = np.mean([1/len(ec) for ec in equiv_class])
+    avg_rir = np.mean([1 / len(ec) for ec in equiv_class])
     return avg_rir