add new line for pep8

Author: rflamary

test/test_da.py

@@ -483,4 +483,4 @@ def test_linear_mapping_class():
     Ct = np.cov(Xt.T)
     Cst = np.cov(Xst.T)
 
-    np.testing.assert_allclose(Ct, Cst, rtol=1e-2, atol=1e-2)
+    np.testing.assert_allclose(Ct, Cst, rtol=1e-2, atol=1e-2)