Add a CHANGELOG

Author: fitzgen

CHANGELOG.md

@@ -0,0 +1,47 @@
+## Unreleased
+
+Released YYYY-MM-DD.
+
+### Added
+
+* TODO (or remove section if none)
+
+### Changed
+
+* TODO (or remove section if none)
+
+### Deprecated
+
+* TODO (or remove section if none)
+
+### Removed
+
+* TODO (or remove section if none)
+
+### Fixed
+
+* TODO (or remove section if none)
+
+### Security
+
+* TODO (or remove section if none)
+
+--------------------------------------------------------------------------------
+
+## 0.2.0
+
+Released 2020-01-14.
+
+### Changed
+
+* Using `arbitrary` 0.3.x now. It is re-exported as `libfuzzer_sys::arbitrary`.
+
+### Added
+
+* You can enable support for `#[derive(Arbitrary)]` with the
+  `"arbitrary-derive"` cargo feature. This is a synonym for the `arbitrary`
+  crate's `"derive"` cargo feature.
+
+--------------------------------------------------------------------------------
+
+## 0.1.0