Add missing items in CHANGELOG

CHANGELOG.md

@@ -35,13 +35,18 @@ Possible breaking changes:
  - Bug Fix: Disallow modifying attributes in Modules after they are initialized.
  - Raise an error when saving a checkpoint which has a smaller step than the
    latest checkpoint already saved.
+ - MultiOptimizer now rejects the case where multiple sub optimizers update the
+   same parameter.
 
 Other changes:
  - Added custom error classes to many Linen errors. See: 
    https://flax.readthedocs.io/en/latest/flax.errors.html
  - Adds `Module.bind` for binding variables and RNGs to an interactive Module.
+ - Adds `nn.apply` and `nn.init` for transforming arbitrary functions that take a `linen.Module` as their first argument.
  - Add option to overwrite existing checkpoints in `save_checkpoint`.
  - Remove JAX omnistaging check for forward compatibility.
+ - Pathlib compatibility for checkpoint paths.
+ - `is_leaf` argument in `traverse_util.flatten_dict`
 
 0.3.2
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