iThemes Security Pro 8.4.2

Bug Fix: Updated reCAPTCHA logic to fix a compatibility issue with iTheme Exchange's usage of Security's reCAPTCHA feature.

Bug Fix: Fixed a timing issue that prevented Privilege Escalation from giving the escalated user access to Appearance > Customize.
Bug Fix: Reimplemented support for some removed reCAPTCHA class functions to fix a compatibility issue with iThemes Exchange.

New Feature: Added support for the new Invisible reCAPTCHA.
Enhancement: Removed AhrefsBot from the HackRepair blacklist as they are legitimate bot.
Bug Fix: Removed warning that could appear: "Undefined offset: 0 in ithemes-security-pro/pro/user-security-check/class-itsec-user-security-check.php"
Bug Fix: Removed warning: "Non-static method ITSEC_Setup::uninstall() should not be called statically".