Add Changelog

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+
+- **Breaking Change**
+  Changed the SwiftDoc GitHub Action to require a secret named
+  `GH_PERSONAL_ACCESS_TOKEN` (previously `GITHUB_PERSONAL_ACCESS_TOKEN`).
+  According to the GitHub Help article
+  ["Creating and storing encrypted secrets"](https://help.github.com/en/actions/configuring-and-managing-workflows/creating-and-storing-encrypted-secrets#creating-encrypted-secrets):
+  > Secret names cannot include any spaces or start with the `GITHUB_` prefix.
+  > 8837d82 by @mattt.
+- **Breaking Change**
+  Changed the SwiftDoc GitHub Action to require a `module-name` parameter
+  and accepts a `format` parameter.
+  b231c07 by @mattt.
+- Changed output for CommonMark format to omit Home page
+  for output with only a single page.
+  #55 by @mattt.
+- Changed output for CommonMark format to nest sections in Members component.
+  #55 by @mattt.
+- Changed output for CommonMark format to remove initializer clauses
+  from variable and enumeration case declarations.
+  #55 by @mattt.
+- Changed CI tests to build and run with a `release` configuration
+  for consistency with the executable built with `make install`.
+  #51 by @mattt.
+- Changed use of `print` statements,
+  replacing them with a formal logging infrastructure.
+  #52 by @mattt.
+
+### Fixed
+
+- Fixed bug in `SourceFile.Visitor` that caused incorrect results
+  when determining the context of symbols parsed from Swift source files.
+  #51 by @mattt.
+- Fixed SwiftDoc GitHub action to build against latest version of `swift-doc`.
+  5c0e4e0 by @mattt
+- Fixed output for CommonMark format to escape GitHub Emoji shortcodes
+  #55 by @mattt.
+- Fixed output for CommonMark format to remove duplicate headings
+  for global symbol pages.
+  #55 by @mattt.
+- Fixed documentation for SwiftDoc GitHub Action
+  to clarify that only a single path can be specified for the `input` parameter.
+  c34ccc1 by @mattt (#19).
+- Fixed `coverage` subcommand description.
+  #16 by @rastersize.
+
+## [1.0.0-beta.1] - 2020-04-01
+
+### Added
+
+- Added HTML output format.
+  #21 by @mattt.
+
+### Changed
+
+- **Breaking Change**
+  Changed minimum Swift version requirements to 5.2 or later.
+  #21 by @mattt.
+- Changed command-line interface to provide functionality through subcommands.
+  #21 by @mattt.
+- Changed `Package.swift` to add `swift-doc` executable and `SwiftDoc` library
+  to the list of package products.
+  #21 by @mattt.
+
+## [0.1.1] - 2020-03-30
+
+### Changed
+
+- Changed documentation workflow to use `github-wiki-publish-action@v1`.
+  4525b8e by @mattt.
+
+## [0.1.0] - 2020-03-28
+
+### Added
+
+- Added initial test suite for `SwiftDoc` target.
+  #17 by @mattt.
+
+### Changed
+
+- Changed command-line interface to use `swift-argument-parser`.
+  #20 by @mattt.
+
+### Fixed
+
+- Fixed treatment of members of public protocol to be considered public symbols.
+  #17 by @mattt.
+
+### Removed
+
+- Removed `api-inventory` subcommand.
+  (This functionality can now be found in its own repository:
+  https://github.com/SwiftDocOrg/swift-api-inventory)
+  #17 by @mattt.
+
+## [0.0.4] - 2020-03-10
+
+### Changed
+
+- Changed `Package.swift` to include `SwiftDoc` library product in manifest.
+  f852a14 by @mattt.
+- Changed documentation workflow to generate docs for `SwiftDoc` sources only.
+  da04436 by @mattt.
+
+### Fixed
+
+- Fixed generation to return symbols in consistent order.
+  97b2347 by @mattt.
+- Fixed how enumeration cases are considered to have public access level.
+  774faf6 by @mattt.
+
+## [0.0.3] - 2020-02-13
+
+### Added
+
+- Added CI workflow.
+  ce40367 by @mattt.
+- Added documentation workflow.
+  a47f178 by @mattt.
+
+### Changed
+
+- Changed documentation generation to filter non-public symbols.
+  3af57a6 by @mattt.
+
+## [0.0.2] - 2020-02-06
+
+### Added
+
+- Added "Installation" section to README.
+  7784bef by @mattt.
+- Added experimental `swift-api-diagram` executable.
+  017e920 by @mattt.
+
+### Fixed
+
+- Fixed division by zero when calculating documentation coverage.
+  #5 by @mattt.
+- Fixed treatment of directories with `.swift` suffix.
+  #14 by @mattt.
+- Fixed errors in README.
+  #4 by @Dinsen.
+  #6 by @HeEAaD.
+  #10 by @morqon
+
+## [0.0.1] - 2020-01-27
+
+Initial release.
+
+[unreleased]: https://github.com/SwiftDocOrg/swift-doc/compare/1.0.0-beta.1...master
+[1.0.0-beta.1]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/1.0.0-beta.1
+[0.1.1]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.1.1
+[0.1.0]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.1.0
+[0.0.4]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.0.4
+[0.0.3]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.0.3
+[0.0.2]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.0.2
+[0.0.1]: https://github.com/SwiftDocOrg/swift-doc/releases/tag/0.0.1