chore: add releases notes

Author: Ark4ne

CHANGELOG-1.4.md

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+Release note
+============
+
+# v1.4.0
+### Added
+- Add support for enum in values
+- Add auto check when-has attributes
+- Add auto set when-included relationships
+- Add polyfill for `unless` method
+- Surcharge `whenHas` method for support none eloquent models
+
+### Breaking changes
+- Drop support for PHP 8.0