docs: Add/update CHANGELOG.

Author: drupol

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).
+
+## [1.0.0](https://github.com/ecphp/php-directive-bundle/compare/0.0.1...1.0.0)
+
+### Merged
+
+- Remove var_dump [`#2`](https://github.com/ecphp/php-directive-bundle/pull/2)
+
+### Commits
+
+- docs: Update README. [`5fd9739`](https://github.com/ecphp/php-directive-bundle/commit/5fd973952a8dde502db7bf8c1c4f8f84765f7679)
+- ci: Update integration tests workflow. [`0d6351c`](https://github.com/ecphp/php-directive-bundle/commit/0d6351c2f7b4ca7c1aac075cb8c2f490a957db30)
+- ci: Add integration tests. [`e386c2f`](https://github.com/ecphp/php-directive-bundle/commit/e386c2fed9dd05969468c89fb5aa42a88a8e9389)
+- tests: Fix typo. [`a65d712`](https://github.com/ecphp/php-directive-bundle/commit/a65d7124a43a5ecbb9c677ab51bab398563caa28)
+- tests: Enable Behat tests. [`784b156`](https://github.com/ecphp/php-directive-bundle/commit/784b1560ddf9165c7ec842ccf1bda474281172fc)
+- docs: Update README. [`cb714c5`](https://github.com/ecphp/php-directive-bundle/commit/cb714c51a5443a0930e957635d908b62f5d9f71c)
+- docs: Update README file. [`e228f8e`](https://github.com/ecphp/php-directive-bundle/commit/e228f8e10818f5a7418fe025fe188462f40bf807)
+- docs: Update Usage section. [`3022a6e`](https://github.com/ecphp/php-directive-bundle/commit/3022a6ecc5aeef169bcb7f5bf75ed3958d0c3038)
+- tests: Add spec tests. [`32fd70a`](https://github.com/ecphp/php-directive-bundle/commit/32fd70a7ed7acc3d38f332bcea066318955cbbea)
+- ci: Enable PHPSpec tests. [`0bf3615`](https://github.com/ecphp/php-directive-bundle/commit/0bf361524c5c703a63b886044837e21ab979aeab)
+- ci: Update CI jobs. [`feb67ff`](https://github.com/ecphp/php-directive-bundle/commit/feb67ff8286a00b868153692076699a68ee63b1a)
+- tests: Add spec tests. [`b24b06c`](https://github.com/ecphp/php-directive-bundle/commit/b24b06c6a95a36ac783a6ce13cac0fe0e1e64f96)
+- Initial set of files. [`01c115a`](https://github.com/ecphp/php-directive-bundle/commit/01c115a2fc6dd7bbe742f56cdfb90e6c9cf7815f)
+
+## 0.0.1 - 2021-06-10
+
+### Commits
+
+- Initial commit. [`4d8c14e`](https://github.com/ecphp/php-directive-bundle/commit/4d8c14e41af7e8422df7378b50be2dfdd8193c73)