fix concatenate test

Author: skoudoro

nibabel/streamlines/tests/test_array_sequence.py

@@ -328,4 +328,4 @@ def test_concatenate():
     seqs = [seq[:, [i]] for i in range(seq.common_shape[0])]
     new_seq = concatenate(seqs, axis=0)
     assert_true(len(new_seq), seq.common_shape[0] * len(seq))
-    assert_array_equal(new_seq._data, seq._data.T.reshape((-1, 1)))
+    assert_array_equal(new_seq._data, seq._data.T.reshape((-1, 0)))