add changelog

CHANGELOG.md

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+## 0.2
+
+### Features
+
+- Natural/Alphanumeric sorting of directory entries.
+- Optional TLS.
+- Symlinks were made forbidden.
+- Sends `Cache-Control: no-store` for HTTP 1.1+ clients that obey it (pretty much all major browsers).
+
+### Improvements
+
+- Rendering performance and size was improved.
+- Various refactors and simplifications.
+- Better CLI help text, and ported homegrown stuff to `flag`.
+
+### Bug Fixes
+
+n/a
+
+### Regressions
+
+n/a
+
+## 0.1
+
+Initial release.