docs: Add changelog and upgrade documentation for version 6.0

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- Add URI translation, package:// URI scheme & bundle spec schemas ([#362](https://github.com/jsonrainbow/json-schema/pull/362))
+- Add quiet option ([#382](https://github.com/jsonrainbow/json-schema/pull/382))
+- Add option to disable validation of "format" constraint ([#383](https://github.com/jsonrainbow/json-schema/pull/383))
+- Add more unit tests ([#366](https://github.com/jsonrainbow/json-schema/pull/366))
+- Reset errors prior to validation ([#386](https://github.com/jsonrainbow/json-schema/pull/386))
+- Allow the schema to be an associative array ([#389](https://github.com/jsonrainbow/json-schema/pull/389))
+- Enable FILTER_FLAG_EMAIL_UNICODE for email format if present ([#398](https://github.com/jsonrainbow/json-schema/pull/398))
+- Add enum wrapper ([#375](https://github.com/jsonrainbow/json-schema/pull/375))
+- Add option to validate the schema ([#357](https://github.com/jsonrainbow/json-schema/pull/357))
+- Add support for "const" ([#507](https://github.com/jsonrainbow/json-schema/pull/507))
+- Added note about supported Draft versions ([#620](https://github.com/jsonrainbow/json-schema/pull/620))
+- Add linting GH action
+### Changed
+- Centralize errors ([#364](https://github.com/jsonrainbow/json-schema/pull/364))
+- Revert "An email is a string, not much else." ([#373](https://github.com/jsonrainbow/json-schema/pull/373))
+- Improvements to type coercion ([#384](https://github.com/jsonrainbow/json-schema/pull/384))
+- Don't add a file:// prefix to URI that already have a scheme ([#455](https://github.com/jsonrainbow/json-schema/pull/455))
+- Enhancement: Normalize` composer.json` ([#505](https://github.com/jsonrainbow/json-schema/pull/505))
+- Correct echo `sprintf` for `printf` ([#634](https://github.com/jsonrainbow/json-schema/pull/634))
+- Streamline validation of Regex ([#650](https://github.com/jsonrainbow/json-schema/pull/650))
+- Streamline validation of patternProperties Regex ([#653](https://github.com/jsonrainbow/json-schema/pull/653))
+- Switch to GH Actions ([#670](https://github.com/jsonrainbow/json-schema/pull/670))
+- Updated PHPStan
+- Remove unwanted whitespace ([#700](https://github.com/jsonrainbow/json-schema/pull/700))
+- Bump to v4 versions of GitHub actions ([#722](https://github.com/jsonrainbow/json-schema/pull/722))
+- Update references to jsonrainbow ([#725](https://github.com/jsonrainbow/json-schema/pull/725))
+### Deprecated
+- Mark check() and coerce() as deprecated ([#476](https://github.com/jsonrainbow/json-schema/pull/476))
+### Removed
+- Remove stale files from #357 (obviated by #362) ([#400](https://github.com/jsonrainbow/json-schema/pull/400))
+- Remove unnecessary fallbacks when args accept null
+- Removed unused variable in UndefinedConstraint ([#698](https://github.com/jsonrainbow/json-schema/pull/698))
+- Remove dead block of code ([#710](https://github.com/jsonrainbow/json-schema/pull/710))
+### Fixed
+- Add use line for InvalidArgumentException ([#370](https://github.com/jsonrainbow/json-schema/pull/370))
+- Add use line for InvalidArgumentException & adjust scope ([#372](https://github.com/jsonrainbow/json-schema/pull/372))
+- Add provided schema under a dummy / internal URI (fixes #376) ([#378](https://github.com/jsonrainbow/json-schema/pull/378))
+- Don't throw exceptions until after checking anyOf / oneOf ([#394](https://github.com/jsonrainbow/json-schema/pull/394))
+- Fix infinite recursion on some schemas when setting defaults (#359) ([#365](https://github.com/jsonrainbow/json-schema/pull/365))
+- Fix autoload to work properly with composer dependencies ([#401](https://github.com/jsonrainbow/json-schema/pull/401))
+- Ignore $ref siblings & abort on infinite-loop references ([#437](https://github.com/jsonrainbow/json-schema/pull/437))
+- Don't cast multipleOf to be an integer for the error message ([#471](https://github.com/jsonrainbow/json-schema/pull/471))
+- Strict Enum/Const Object Checking ([#518](https://github.com/jsonrainbow/json-schema/pull/518))
+- Return original value when no cast ([#535](https://github.com/jsonrainbow/json-schema/pull/535))
+- Allow `marc-mabe/php-enum` v2.x and v3.x. ([#464](https://github.com/jsonrainbow/json-schema/pull/464))
+- Deprecated warning message on composer install command ([#614](https://github.com/jsonrainbow/json-schema/pull/614))
+- Allow `marc-mabe/php-enum` v4.x ([#629](https://github.com/jsonrainbow/json-schema/pull/629))
+- Fixed method convertJsonPointerIntoPropertyPath in wrong class ([#655](https://github.com/jsonrainbow/json-schema/pull/655))
+- Fix type validation failing for "any" and false-y type wording ([#686](https://github.com/jsonrainbow/json-schema/pull/686))
+- Correct code style
+- Fix: Clean up `.gitattributes` ([#687](https://github.com/jsonrainbow/json-schema/pull/687))
+- Fix: Order `friendsofphp/php-cs-fixer` rules ([#688](https://github.com/jsonrainbow/json-schema/pull/688))
+- HTTP to HTTPS redirection breaks remote reference resolution ([#709](https://github.com/jsonrainbow/json-schema/pull/709))
+- Corrected several typos and code style issues

UPGRADE-6.0.md

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+UPGRADE FROM 5.3 to 6.0
+=======================
+
+## Introduction
+
+We are excited to release version 6.0 of our open-source package, featuring major improvements and important updates. This release includes several breaking changes from version 5.3 aimed at enhancing performance, security, and flexibility.
+
+Please review the following breaking changes carefully and update your implementations to ensure compatibility with version 6.0. This guide provides key modifications and instructions for a smooth transition.
+
+Thank you for your support and contributions to the project.
+
+## Errors
+* `constraint` key is no longer the constraint name but contains more information in order to translate violations.
+
+    *Before*
+    ```php
+    foreach ($validator->getErrors() as $error) {
+        echo $error['constraint']; // required
+    }
+    ```
+
+    *After*
+    ```php
+    foreach ($validator->getErrors() as $error) {
+        echo $error['constraint']['name']; // required
+    }
+    ```