Update changelog for v3.0.0 release

Author: sferik

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Accept any Enumerable (not just Hash or Array) as form data input for both
+  `Multipart` and `Urlencoded` encoders. This enables lazy enumerators and
+  custom collections as input.
+- `FormData.ensure_data` for coercing input to an Enumerable of key-value pairs.
+- Array of pairs input for `Multipart`, allowing duplicate parameter names and
+  preserved ordering.
+- Array of pairs input for `Urlencoded`, preserving duplicate keys.
+- RBS type signatures for all public and private APIs.
+- `sig/` directory shipped in the gem for downstream type checking.
+- `homepage_uri`, `source_code_uri`, `bug_tracker_uri`, and `documentation_uri`
+  gemspec metadata.
+
+### Changed
+
+- Default urlencoded encoder replaced with a custom implementation that supports
+  nested Hashes and Arrays (e.g., `{foo: {bar: "baz"}}` encodes as
+  `foo[bar]=baz`). Previously used `URI.encode_www_form`.
+- `FormData.ensure_hash` no longer treats `nil` as a special case; `nil.to_h`
+  returns `{}` which is used instead.
+
+### Removed
+
+- Ruby < 3.2 support.
+- Explicit JRuby support.
+
+## [2.3.0] - 2020-03-08
+
+### Added
+
+- Per-instance encoder for `HTTP::FormData::Urlencoded`.
+  ([#29](https://github.com/httprb/form_data/pull/29) by [@summera])
+
+## [2.2.0] - 2020-01-09
+
+### Fixed
+
+- Ruby 2.7 compatibility.
+  ([#28](https://github.com/httprb/form_data/pull/28) by [@janko])
+
+## [2.1.1] - 2018-06-01
+
+### Added
+
+- Allow overriding urlencoded form data encoder.
+  ([#23](https://github.com/httprb/form_data/pull/23) by [@FabienChaynes])
+
+## [2.1.0] - 2018-03-05
+
+### Fixed
+
+- Rewind content at the end of `Readable#to_s`.
+  ([#21](https://github.com/httprb/form_data/pull/21) by [@janko-m])
+- Buffer encoding.
+  ([#19](https://github.com/httprb/form_data/pull/19) by [@HoneyryderChuck])
+
+## [2.0.0] - 2017-10-01
+
+### Fixed
+
+- Add CRLF character to end of multipart body.
+  ([#17](https://github.com/httprb/form_data/pull/17) by [@mhickman])
+
+## [2.0.0.pre2] - 2017-05-11
+
+### Added
+
+- Streaming for urlencoded form data.
+  ([#14](https://github.com/httprb/form_data/pull/14) by [@janko-m])
+
+## [2.0.0.pre1] - 2017-05-10
+
+### Added
+
+- Form data streaming.
+  ([#12](https://github.com/httprb/form_data.rb/pull/12) by [@janko-m])
+
+## [1.0.2] - 2017-05-08
+
+### Added
+
+- Allow setting Content-Type on non-file parts.
+  ([#5](https://github.com/httprb/form_data.rb/issues/5) by [@abotalov])
+- Creation of file parts without filename.
+  ([#6](https://github.com/httprb/form_data.rb/issues/6) by [@abotalov])
+
+### Deprecated
+
+- `HTTP::FormData::File#mime_type`. Use `#content_type` instead.
+  ([#11](https://github.com/httprb/form_data.rb/pull/11) by [@ixti])
+
+## [1.0.1] - 2015-03-31
+
+### Fixed
+
+- Usage of URI module.
+
+## [1.0.0] - 2015-01-04
+
+### Changed
+
+- Gem renamed to `http-form_data` as `FormData` is no longer a top-level
+  constant: `FormData` → `HTTP::FormData`.
+
+## [0.1.0] - 2015-01-02
+
+### Added
+
+- `nil` support to `FormData#ensure_hash`.
+
+### Changed
+
+- Moved repo under `httprb` organization on GitHub.
+
+## [0.0.1] - 2014-12-15
+
+### Added
+
+- Initial release.
+
+[Unreleased]: https://github.com/httprb/form_data/compare/v2.3.0...HEAD
+[2.3.0]: https://github.com/httprb/form_data/compare/v2.2.0...v2.3.0
+[2.2.0]: https://github.com/httprb/form_data/compare/v2.1.1...v2.2.0
+[2.1.1]: https://github.com/httprb/form_data/compare/v2.1.0...v2.1.1
+[2.1.0]: https://github.com/httprb/form_data/compare/v2.0.0...v2.1.0
+[2.0.0]: https://github.com/httprb/form_data/compare/v2.0.0.pre2...v2.0.0
+[2.0.0.pre2]: https://github.com/httprb/form_data/compare/v2.0.0.pre1...v2.0.0.pre2
+[2.0.0.pre1]: https://github.com/httprb/form_data/compare/v1.0.2...v2.0.0.pre1
+[1.0.2]: https://github.com/httprb/form_data/compare/v1.0.1...v1.0.2
+[1.0.1]: https://github.com/httprb/form_data/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/httprb/form_data/compare/v0.1.0...v1.0.0
+[0.1.0]: https://github.com/httprb/form_data/compare/v0.0.1...v0.1.0
+[0.0.1]: https://github.com/httprb/form_data/releases/tag/v0.0.1
+
+[@abotalov]: https://github.com/abotalov
+[@FabienChaynes]: https://github.com/FabienChaynes
+[@HoneyryderChuck]: https://github.com/HoneyryderChuck
+[@ixti]: https://github.com/ixti
+[@janko]: https://github.com/janko
+[@janko-m]: https://github.com/janko-m
+[@mhickman]: https://github.com/mhickman
+[@summera]: https://github.com/summera