fix tests

Author: chrisgorgo

nipype/algorithms/tests/test_confounds.py

@@ -71,5 +71,5 @@ def test_outliers(tmpdir):
     in_data = np.random.randn(100)
     in_data[0] += 10
 
-    assert _is_outlier(in_data) == 1
+    assert is_outlier(in_data) == 1