message: Add info about the breaking change
diff: ## 1.0.1 - 2021-01-12
  +This release includes a breaking change in the API (changing the trait `enumset::EnumsetType` to `wasmer_enumset::EnumSetType` and changing `enumset::EnumSet` in signatures to `wasmer_enumset::EnumSet` to work around a breaking change introduced by `syn`) but is being released as a minor version because `1.0.0` is also in a broken state due to a breaking change introduced by `syn` which affects `enumset` and thus `wasmer`.
  +
  +This change is unlikely to affect any users of `wasmer`, but if it does please change uses of the `enumset` crate to the `wasmer_enumset` crate where possible.
  +
  ### Added
  - [#2005](https://github.com/wasmerio/wasmer/pull/2005) Added the arguments `alias` and `optional` to `WasmerEnv` derive's `export` attribute.
  