Add CHANGELOG.md

Author: oxalica

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## Unreleased
+
+### Documentation
+
+- Update docs to allow organizational MS accounts. [#10]
+
+### Fixes
+
+- Fix missing `c_tag` selection.
+
+### Internal
+
+- Update `config` to 0.14, `env_logger` to 0.11, and fix compilation.
+- Refactor and update flake to minify dependencies.
+
+[#10]: https://github.com/oxalica/onedrive-fuse/pull/10