Switch from Travis CI to GitHub Actions (#20)

docs/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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+
+- Switch to GitHub actions.
+  - Benefits include faster responses.
+
+### Removed
+
+- Removed Travis CI.
+
+## [2.1.0] - 2020-06-08
+
+### Changed
+
+- 10 coins of each type can now be crafted using 2 ingots (bronze, silver or gold).
+  - Silver coins require [More Ores](https://github.com/minetest-mods/moreores)
+    to be crafted, since minetest_game doesn't have silver ingots.
+- Coins are now displayed in the creative inventory.
+- Moved translations from intllib to Minetest's built-in localization system.
+  - This allows translations to show up independently of the server's language.
+
+## [2.0.0] - 2019-11-25
+
+### Changed
+
+- The minimum supported Minetest version is now 5.0.0.
+- Map Tools nodes/items can no longer be dropped to prevent them from falling
+  into bad hands.
+
+### Fixed
+
+- The inventory images of `no_interact`, `no_build`, `ignore_like_no_clip`
+  and `ignore_like_no_point` now use textures that are available in
+  Minetest Game 5.0.0.
+
+## [1.1.0] - 2019-03-23
+
+### Changed
+
+- Increased the range of the Admin Pickaxe from 12 to 20 nodes.
+- Updated intllib support to avoid using deprecated functions.
+
+## 1.0.0 - 2017-02-19
+
+- Initial versioned release.
+
+[Unreleased]: https://github.com/minetest-mods/maptools/compare/v2.1.0...HEAD
+[2.1.0]: https://github.com/minetest-mods/maptools/compare/v2.0.0...v2.1.0
+[2.0.0]: https://github.com/minetest-mods/maptools/compare/v1.1.0...v2.0.0
+[1.1.0]: https://github.com/minetest-mods/maptools/compare/v1.0.0...v1.1.0