Adopt PEP 484 type hints for C++ types exported to Python
diff --git a/example/example-numpy-vectorize.py b/example/example-numpy-vectorize.py
index e21c1a5..322ce2a 100755
--- a/example/example-numpy-vectorize.py
+++ b/example/example-numpy-vectorize.py
@@ -32,3 +32,5 @@
 selective_func(np.array([1], dtype=np.int32))
 selective_func(np.array([1.0], dtype=np.float32))
 selective_func(np.array([1.0j], dtype=np.complex64))
+
+print(vectorized_func.__doc__)