Edit File: UPGRADING_v4.md
## Upgrading to v4 - `Jfcherng\Diff\Utility\SequenceMatcher` becomes [a new package](https://packagist.org/packages/jfcherng/php-sequence-matcher) by the namespace of `Jfcherng\Diff\SequenceMatcher`. - Factories under `Jfcherng\Diff\Utility\` are moved to `Jfcherng\Diff\Factory\`. For example, `Jfcherng\Diff\Utility\RendererFactory` is now `Jfcherng\Diff\Factory\RendererFactory`. - Non-abstract classes are no longer inheritable as they are added with `final` keywords. (This allows me to do more internal changes without causing possible BC breaks.)
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