Release 2.0.0: PHP ^8.2, portphp ^2.0, GitHub Actions

[slashrsm]

Summary

Major modernization of the XML writer.

Breaking

• php: ^8.2
• portphp/portphp: ^2.0
• Writer methods use : void return types

Other

• GitHub Actions CI, Dependabot
• README / docs URL updates; remove Travis/Scrutinizer
• UPGRADE-2.0.md

Please do not merge until approved.

[Copilot]

Pull request overview

This PR prepares the portphp/xml package for a 2.0.0 release by modernizing runtime requirements (PHP ^8.2, portphp/portphp ^2.0), updating the writer API to match the new core interfaces, and migrating CI from Travis/Scrutinizer to GitHub Actions.

Changes:

• Bump platform/dependency requirements (PHP ^8.2, portphp/portphp ^2.0) and update docs/upgrade guide accordingly.
• Update XmlWriter method signatures to use : void return types.
• Replace legacy CI/QA tooling (Travis/Scrutinizer) with GitHub Actions and add Dependabot configuration.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
UPGRADE-2.0.md	Adds upgrade notes documenting breaking changes for 2.0.0.
src/XmlWriter.php	Updates writer method return types to void to align with updated interfaces.
README.md	Refreshes package naming/badges and updates documentation URL and requirements summary.
phpspec.yml.dist	Updates PhpSpec suite configuration for the new CI flow.
phpspec.yml.ci	Removes the CI-specific PhpSpec/coverage configuration.
composer.json	Updates PHP and dependency constraints; modernizes dev dependencies (PhpSpec ^8).
.travis.yml	Removes Travis CI configuration.
.scrutinizer.yml	Removes Scrutinizer configuration.
.github/workflows/checks.yml	Adds GitHub Actions workflow to run PhpSpec across supported PHP versions.
.github/dependabot.yml	Adds Dependabot updates for GitHub Actions and Composer dependencies.
.gitattributes	Updates export-ignore list to drop legacy CI files (but still contains a stale entry).

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Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

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