+* Initial implementation of the code block feature. Closes [ckeditor/ckeditor5#436](https://github.com/ckeditor/ckeditor5/issues/436). Closes [ckeditor/ckeditor5#5664](https://github.com/ckeditor/ckeditor5/issues/5664). Closes [ckeditor/ckeditor5#5666](https://github.com/ckeditor/ckeditor5/issues/5666). ([eb9ef5e](https://github.com/ckeditor/ckeditor5-code-block/commit/eb9ef5e))
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