Introduce Changelog and PR template

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for your contribution!
+
+Check the following boxes:
+
+- [ ] Wrote [good commit messages][1].
+- [ ] Feature branch is up-to-date with `master` (if not - rebase it).
+- [ ] Squashed related commits together.
+- [ ] Added tests.
+- [ ] Added an entry to the [Changelog](../blob/master/CHANGELOG.md) if the new 
+  code introduces user-observable changes.
+- [ ] The PR relates to *only* one subject with a clear title
+  and description in grammatically correct, complete sentences.
+
+[1]: http://chris.beams.io/posts/git-commit/

CHANGELOG.md

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+# Changelog
+
+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).
+
+In SemVer, changes to dependencies (e.g. dropping EoL rubies)
+are [not necessarily considered breaking][1].
+
+## Unreleased
+
+### Breaking Changes
+
+- None
+
+### Added
+
+- None
+
+### Fixed
+
+- None
+
+## 3.0.0 - 2020-06-10
+
+### Breaking Changes
+
+- None
+
+### Added
+
+- Cucumber 4 support (#762)
+
+### Fixed
+
+- Fix a bundler deprecation when running specs (#761)
+- remove name override logic that never worked (#758)
+
+### Dependencies
+
+- Drop ruby 2.3 support (#760)
+- Drop ruby 2.2 support (#759)
+
+## 2.0.0 - 2015-11-19 
+
+No docs yet. Contributions welcome!
+
+## 1.0.0 - 2014-06-07
+
+No docs yet. Contributions welcome!
+
+[1] https://semver.org/#what-should-i-do-if-i-update-my-own-dependencies-without-changing-the-public-api