prepare changelog for next release

Author: mapix

docs/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+- Addressed an issue where a fresh install would encounter an `AttributeError` due to the removal of `LegacyVersion` class in `packaging.version`. This resolution is detailed in [PR 128](https://github.com/fohrloop/dash-uploader/pull/128), effectively resolving issue [#111](https://github.com/fohrloop/dash-uploader/issues/111).
+- Clarified size units by changing "Mb" to "MB" for better readability and consistency. See the details in [PR 133](https://github.com/fohrloop/dash-uploader/pull/133).
+
 ## 0.7.0-a1 (2022-03-30)
 
 - This pre-release is available in PyPI with `--pre` flag.