W3 Total Cache Pro 2.8.8

Fix: Fixed Memcached flush logic
Fix: Remove disk enhanced rewrites when disabling page cache
Fix: Better handle conflicts on activation

Feature: Added TransparentCDN full-site delivery option
Fix: Update settings on activation in a changed environment
Fix: Fixed a compatibility check for Apache when PHP is running as CGI
Fix: Always set HSTS headers in Apache; not only for 2xx HTTP codes
Fix: Implemented anatomic incrementing of key version in Memcache(d)
Update: Allow filtering of w3tc_minify_url_for_files Minify URL for files

Fix: Cleanup widget and postbox display for WordPress 5.5
Fix: Update to PageSpeed API v5, show webvitals metrics
Fix: Console error when adminbar is hidden and PageSpeed module is active
Fix: Stats view JS issue
Fix: Deprecated jQuery warnings
Fix: Require files for request_filesystem_credentials() call
Added option to disable jquery-migrate on the front-end. Fixed #172 master (#240)