1.9.3

• Improvement: better compatibility with CDNs when displaying webp images with <picture> tags. There is now a new setting field to fill in the CDN URL in use.
• Improvement: don’t use Heartbeat anymore. This speeds up the optimization process and prevents other plugins to break everything when they remove Heartbeat.
• Fix: a fatal error upon plugin deactivation.
• Fix: an occasional fatal error preventing the optimization process to work.
• Fix: conflict with plugins using an ancient version of Composer.
• Fix: php notices displayed on the bulk optimization page on rare cases.
• Fix: a php notice about "Non-string needles" with php 7.3.
• Fix: a php notice displayed when restoring a custom file.