Release Steps for PCon

Increment version in README.md and src/pcon.php
Update PHP versions in src/console_abstract.php, phpcs.xml, and test/full.sh if needed
- reference supported PHP versions and decide what to support.
Run ./test/full.sh and review output for issues
- Be sure to update test/dist/test-readme.md with the new hash as instructed
Run ./lint.sh and fix any issues
Run ./doc.sh
Merge & push to master
Run ./test/usage_update.sh and review output for issues with update for version packaged and deployed during previous steps.
- Optionally re-run ./test/full.sh entirely for a full safety test

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