New Features:
* [New nonlinearities](0409a42fadd9e6da1ec6680c23bddfd64e9d32ce):
* [`stax.Hermite`](https://neural-tangents.readthedocs.io/en/latest/neural_tangents.stax.html#neural_tangents.stax.Hermite);
* [`stax.Exp`](https://neural-tangents.readthedocs.io/en/latest/neural_tangents.stax.html#neural_tangents.stax.Exp);
* [`stax.Gaussian`](https://neural-tangents.readthedocs.io/en/latest/neural_tangents.stax.html#neural_tangents.stax.Gaussian);
* [`stax.ExpNormalized`](https://neural-tangents.readthedocs.io/en/latest/neural_tangents.stax.html#neural_tangents.stax.ExpNormalized).
* [Support and default to `b_std=None` in `stax` layers, treated as symbolic zero, i.e. providing same behavior as `b_std=0.`, but without creating a redundant bias array.](7d01d6513bf7bce5d227aa9f223eb8353cc8c74b)
Breaking changes:
* [Bump requirements to JAX v0.2.25](65d80277e4f2d2b0c285bca52937a3248200877f). In consequence, drop CUDA 10 support to prevent https://github.com/google/neural-tangents/issues/122
* [The `b_std=None` change could be breaking in very rare edge cases. The dummy bias array is replaced with `None` in this case and might potentially break your serialization routine.](7d01d6513bf7bce5d227aa9f223eb8353cc8c74b)