Log Message:
math/py-numpy: Update to 1.16.6

Changes:

- The np.testing.utils functions have been updated from
  1.19.0-dev0. This improves the function documentation and error
  messages as well extending the assert_array_compare function to
  additional types.
- Allow matmul (@) to work with object arrays.
- Fix regression in matmul (@) for boolean types.
- Array comparison assertions include maximum differences.