fix pep8

Author: Hicham Janati

test/test_bregman.py

@@ -490,7 +490,6 @@ def test_barycenter(nx, method, verbose, warn):
         ot.bregman.barycenter(A_nx, M_nx, reg, log=True)
 
 
-
 @pytest.mark.parametrize("method, verbose, warn",
                          product(["sinkhorn", "sinkhorn_stabilized", "sinkhorn_log"],
                                  [True, False], [True, False]))
@@ -526,7 +525,6 @@ def test_barycenter_assymetric_cost(nx, method, verbose, warn):
         ot.bregman.barycenter(A_nx, M_nx, reg, log=True)
 
 
-
 @pytest.mark.parametrize("method, verbose, warn",
                          product(["sinkhorn", "sinkhorn_log"],
                                  [True, False], [True, False]))