V1.2.1: Implement automatic upgrades for the advanced (paid) plugin

Makefile

assets/css/opentools-updatecheck.css

assets/js/opentools-updatecheck.js

opentools-update-checker.php

ordernumbers_woocommerce.php

plugin-update-checker/README.md

plugin-update-checker/composer.json

plugin-update-checker/css/puc-debug-bar.css

plugin-update-checker/debug-bar-panel.php

plugin-update-checker/debug-bar-plugin.php

plugin-update-checker/github-checker.php

plugin-update-checker/js/debug-bar.js

plugin-update-checker/license.txt

plugin-update-checker/plugin-update-checker.php

plugin-update-checker/vendor/Parsedown.php

plugin-update-checker/vendor/readme-parser.php

...es/opentools-woocommerce-ordernumbers-advanced_v1.2.1.zip

woocommerce-advanced-ordernumbers.php