Add changelog for v0.2 (#27)

Author: dentiny

CHANGELOG.md

@@ -0,0 +1,19 @@
+# 0.2.0
+
+## Added
+
+- Support wrapping ANY duckdb compatible filesystems ([#24])
+
+[#24]: https://github.com/dentiny/duckdb-filesystem-observability/pull/24
+
+## Improved
+
+- Rewrite quantile estimation for better accuracy ([#17], [#18], [#19])
+
+[#17]: https://github.com/dentiny/duckdb-filesystem-observability/pull/17
+[#18]: https://github.com/dentiny/duckdb-filesystem-observability/pull/18
+[#19]: https://github.com/dentiny/duckdb-filesystem-observability/pull/19
+
+- Refine display output if there's no interested IO operations happening in the current filesystem ([#25])
+
+[#25]: https://github.com/dentiny/duckdb-filesystem-observability/pull/25