message: Add custom section update to changelog
diff: ## **[Unreleased]**
  +- [#1320](https://github.com/wasmerio/wasmer/pull/1320) Change `custom_sections` field in `ModuleInfo` to be more standards compliant by allowing multiple custom sections with the same name. To get the old behavior with the new API, you can add `.last().unwrap()` to accesses. For example, `module_info.custom_sections["custom_section_name"].last().unwrap()`.
  - [#1303](https://github.com/wasmerio/wasmer/pull/1303) NaN canonicalization for singlepass backend.
  - [#1305](https://github.com/wasmerio/wasmer/pull/1305) Handle panics from DynamicFunc.
  - [#1301](https://github.com/wasmerio/wasmer/pull/1301) Update supported stable Rust version to 1.41.1.
  