docs: Add CHANGELOG.md file.

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).
+
+## [1.0.2](https://github.com/loophp/tin/compare/1.0.1...1.0.2)
+
+### Commits
+
+- ci: Update Github actions configuration. [`2a8aec5`](https://github.com/loophp/tin/commit/2a8aec5fbf69049c51bb75b2f4e372c13bf9aa25)
+- chore: Static files maintenance. [`b251d59`](https://github.com/loophp/tin/commit/b251d593b35b23b7c5d1b0116e7993a73f04caf7)
+
+## [1.0.1](https://github.com/loophp/tin/compare/1.0.0...1.0.1) - 2020-07-26
+
+### Commits
+
+- Update Infection configuration. [`b6a54a2`](https://github.com/loophp/tin/commit/b6a54a219774995668c9f7f7573b3c2cb4fc69bc)
+- Update Grumphp configuration. [`f09db0a`](https://github.com/loophp/tin/commit/f09db0a8a45d19a17d15a87d7d5b607dced273ef)
+- Remove obsolete Infection badge. [`bb30cb7`](https://github.com/loophp/tin/commit/bb30cb77f0e88c1bf9b360c39de651abfa2ba3ad)
+- Enable Psalm, Infection and Insights reports. [`bf5cdfc`](https://github.com/loophp/tin/commit/bf5cdfc1cdd9ddf15a7ad3d59f9bc54fd460a88d)
+
+## 1.0.0 - 2020-03-20
+
+### Commits
+
+- Fix typos in Czech Republic country handler. [`dab7433`](https://github.com/loophp/tin/commit/dab74337118c06a45098458341089482464e85ef)
+- Move repository to new home. [`d37d11e`](https://github.com/loophp/tin/commit/d37d11e99568d83b8f11db1b285625c716b09a60)
+- Refactoring the package. [`cb75a4c`](https://github.com/loophp/tin/commit/cb75a4c543560f694d29c7d1eb0c1fb3639f9485)
+- Incorrect capitalization for class name (not camel case). [`d96e427`](https://github.com/loophp/tin/commit/d96e427cc7a33eb38545ca7b3a601419fb8aebf8)
+- Initial commit. [`53446b2`](https://github.com/loophp/tin/commit/53446b23523592f033536da691ed8e77d2158b3b)