Add the changelog

CHANGELOG.md

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+## 0.2.0 (unreleased)
+
+- Fixed an edge case where long decimals with trailing zeros were truncated.
+- Minor micro-optimization fixes in the fast path parser.
+- Remove the use of unsafe when querying power-of-10 tables.
+- Added float64 roundtrip fuzz target.
+- Added tests for the power-of-5 table using num-bigint.
+- Improvements and new options in the bench tool.
+- Updated benchmark timings, added Apple M1 and AMD Rome timings.
+
+## 0.1.0
+
+Initial release, fully tested and benchmarked.