Update `README.md` to point to updated TensorFlow Hub model with homology head.
Update `README.md` to point to updated TensorFlow Hub model with homology head.

PiperOrigin-RevId: 438033274

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research