As of now version 0.7.2 requires WordPress 4.3 and PHP 5.6. There are some potential benefits and more modern ways we could approach further enhancements and bug fixes in the plugin if we considered (and did) bump those minimum versions. Specifically #455 could be easier/better/simpler to handle if we bumped the PHP minimum to 7.2. Similarly #389 might also be easier/better/simple to handle if we bumped the WordPress minimum to 5.2. I might even suggest that we consider PHP 7.4 (as that still gets EOL later this year) and WordPress 5.3 (released ~3 years ago) or 5.6 (released ~2 years ago) as more modern/current minimums to maintain, but at least considering PHP 7.2 and WordPress 5.2 will help with the issues/PRs noted above.