tests/test_cvec.py: add missing header

diff --git a/python/tests/test_cvec.py b/python/tests/test_cvec.py
index 8691646..2cc76ef 100755 (executable)
--- a/python/tests/test_cvec.py
+++ b/python/tests/test_cvec.py
@@ -1,3 +1,5 @@
+#! /usr/bin/env python
+
 from numpy.testing import TestCase, run_module_suite
 from numpy.testing import assert_equal, assert_almost_equal
 from aubio import cvec