InsightFace pretrained model terms

Upstream: https://github.com/deepinsight/insightface/tree/master/python-package

The pretrained models provided with this library are for non-commercial
research only, whether downloaded automatically or manually.

These terms apply to the buffalo_s face detection and recognition models
(det_500m.onnx and w600k_mbf.onnx), not to the MIT-licensed library code.