docs: v0.1.0 changelog (#96)

* docs: update CHANGELOG.md

* docs: pr template

.github/PULL_REQUEST_TEMPLATE.md

@@ -15,6 +15,7 @@ e.g. This PR refactors the X submodule, applying Y's algorithm to improve Z by K
 <!-- Please mark items as completed where appropriate. e.g. [x]. -->
 
 - [ ] This PR has sufficient test coverage.
+- [ ] I have updated the CHANGELOG.md.
 
 ## Additional Comments
 

CHANGELOG.md

@@ -2,10 +2,14 @@
 
 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).
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [Unreleased]
+From v1.0.0 onwards, this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). Pre-v1, breaking changes will be indicated via a minor release, while all other changes will fall under patches. At any time, you can see what's in progress for a version by filtering GitHub issues by milestone.
 
-- [feat] support --snapshot-update cli flag to write snapshots
-- [feat] support custom plugins for writing snapshots, inc. image plugin
+## Master (Unreleased)
+
+Up to date with releases.
+
+## v0.1.0
+
+- Initial release respecting [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).