Add CHANGELOG.md

Author: i80and

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]
+### Added
+- The `literalinclude` directive.
+- AST nodes for substitutions.
+### Changed
+- Only match PAT_EXPLICIT_TILE if needed by role.
+
+  Roles are now categorized in one of three ways:
+  * `text` roles only provide a label field in the AST.
+  * `explicit_title` roles provide a target field in the AST, as well as
+    optionally a label field.
+  * `link` roles do not emit a role node at all; instead, they emit a
+    reference with the refuri already set.
+### Fixed
+- Multiline directive arguments.
+- Include guide "languages" in legacy guide syntax.
+- `:dedent:` on `literalinclude` directives with empty lines.
+- Child giza nodes should not always have their parent's ref.
+- Extracts should be created with the category `extracts`, not `extract`.
+
+
+## [v0.1.5] - 2019-03-28
+### Added
+- Support additional directives and roles
+
+## [v0.1.4] - 2019-03-28
+### Added
+- Bundle Python hash function implementations temporarily.
+- Add support for additional MongoDB rst constructs.
+
+## [v0.1.3] - 2019-03-27
+### Added
+- Substitute constants from language-server.
+- Report bad project config.
+- Force encodings to utf-8.
+
+## [v0.1.2] - 2019-03-27
+### Added
+- Bundle OpenSSL with the macOS binary release.
+
+## [v0.1.1] - 2019-03-22
+### Added
+- Bundle Python with the binary release.