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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org).
+
+<!--
+Note: In this file, do not use the hard wrap in the middle of a sentence for compatibility with GitHub comment style markdown rendering.
+-->
+
+## [Unreleased]
+
+## [0.4.5] - 2021-01-05
+
+- Exclude unneeded files from crates.io.
+
+## [0.4.4] - 2020-11-02
+
+- [Accept `const_fn` attribute with no arguments and functions without `const` keyword.](https://github.com/taiki-e/const_fn/pull/34)
+  This allows `const_fn` to be used as an optional dependency.
+
+  ```rust
+  #[cfg_attr(feature = "...", const_fn::const_fn)]
+  pub fn func() {
+      /* ... */
+  }
+  ```
+
+## [0.4.3] - 2020-11-02
+
+- [`const_fn` no longer fails to compile if unable to determine rustc version. Instead, it now displays a warning.](https://github.com/taiki-e/const_fn/pull/31)
+
+- [`const_fn` no longer relies on debug print format.](https://github.com/taiki-e/const_fn/pull/30)
+
+## [0.4.2] - 2020-08-31
+
+- [Improve error messages when failed to parse version information.](https://github.com/taiki-e/const_fn/pull/26)
+
+- [Fix compile failure with cargo installed by yum.](https://github.com/taiki-e/const_fn/pull/26)
+
+## [0.4.1] - 2020-08-25
+
+- [Fix compile failure with non-cargo build systems.](https://github.com/taiki-e/const_fn/pull/23)
+
+## [0.4.0] - 2020-08-25
+
+- [Add support for version-based code generation.](https://github.com/taiki-e/const_fn/pull/17) The following conditions are available:
+
+  ```rust
+  use const_fn::const_fn;
+
+  // function is `const` on specified version and later compiler (including beta and nightly)
+  #[const_fn("1.36")]
+  pub const fn version() {
+      /* ... */
+  }
+
+  // function is `const` on nightly compiler (including dev build)
+  #[const_fn(nightly)]
+  pub const fn nightly() {
+      /* ... */
+  }
+
+  // function is `const` if `cfg(...)` is true
+  #[const_fn(cfg(...))]
+  pub const fn cfg() {
+      /* ... */
+  }
+
+  // function is `const` if `cfg(feature = "...")` is true
+  #[const_fn(feature = "...")]
+  pub const fn feature() {
+      /* ... */
+  }
+  ```
+
+- Improve compile time by removing proc-macro related dependencies ([#18](https://github.com/taiki-e/const_fn/pull/18), [#20](https://github.com/taiki-e/const_fn/pull/20)).
+
+## [0.3.1] - 2019-12-09
+
+- Updated `syn-mid` to 0.5.
+
+## [0.3.0] - 2019-10-20
+
+- `#[const_fn]` attribute may only be used on const functions.
+
+## [0.2.1] - 2019-08-15
+
+- Updated `proc-macro2`, `syn`, and `quote` to 1.0.
+
+- Updated `syn-mid` to 0.4.
+
+## [0.2.0] - 2019-06-16
+
+- Transition to Rust 2018. With this change, the minimum required version will go up to Rust 1.31.
+
+## [0.1.7] - 2019-02-18
+
+- Update syn-mid version to 0.3
+
+## [0.1.6] - 2019-02-15
+
+- Reduce compilation time
+
+## [0.1.5] - 2019-02-15
+
+- Revert 0.1.4
+
+## [0.1.4] - 2019-02-15
+
+**Note: This release has been yanked.**
+
+- Reduce compilation time
+
+## [0.1.3] - 2019-01-06
+
+- Fix dependencies
+
+## [0.1.2] - 2018-12-27
+
+- Improve error messages
+
+## [0.1.1] - 2018-12-27
+
+- Improve an error message
+
+## [0.1.0] - 2018-12-25
+
+Initial release
+
+[Unreleased]: https://github.com/taiki-e/const_fn/compare/v0.4.5...HEAD
+[0.4.5]: https://github.com/taiki-e/const_fn/compare/v0.4.4...v0.4.5
+[0.4.4]: https://github.com/taiki-e/const_fn/compare/v0.4.3...v0.4.4
+[0.4.3]: https://github.com/taiki-e/const_fn/compare/v0.4.2...v0.4.3
+[0.4.2]: https://github.com/taiki-e/const_fn/compare/v0.4.1...v0.4.2
+[0.4.1]: https://github.com/taiki-e/const_fn/compare/v0.4.0...v0.4.1
+[0.4.0]: https://github.com/taiki-e/const_fn/compare/v0.3.1...v0.4.0
+[0.3.1]: https://github.com/taiki-e/const_fn/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/taiki-e/const_fn/compare/v0.2.1...v0.3.0
+[0.2.1]: https://github.com/taiki-e/const_fn/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/taiki-e/const_fn/compare/v0.1.7...v0.2.0
+[0.1.7]: https://github.com/taiki-e/const_fn/compare/v0.1.6...v0.1.7
+[0.1.6]: https://github.com/taiki-e/const_fn/compare/v0.1.5...v0.1.6
+[0.1.5]: https://github.com/taiki-e/const_fn/compare/v0.1.4...v0.1.5
+[0.1.4]: https://github.com/taiki-e/const_fn/compare/v0.1.3...v0.1.4
+[0.1.3]: https://github.com/taiki-e/const_fn/compare/v0.1.2...v0.1.3
+[0.1.2]: https://github.com/taiki-e/const_fn/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/taiki-e/const_fn/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/taiki-e/const_fn/releases/tag/v0.1.0