Add CHANGELOG.md

Author: Veykril

CHANGELOG.md

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+# Changelog
+
+## 0.3.1 - 2024-09-04
+
+- Fix `SmolStrBuilder` leaking implementation details
+
+## 0.3.0 - 2024-09-04
+
+- Removed deprecated `SmolStr::new_inline_from_ascii` function
+- Removed `SmolStr::to_string` in favor of `ToString::to_string`
+- Added `impl AsRef<[u8]> for SmolStr` impl
+- Added `impl AsRef<OsStr> for SmolStr` impl
+- Added `impl AsRef<Path> for SmolStr` impl
+- Added `SmolStrBuilder`