WP Mail SMTP Pro 4.2.0

### IMPORTANT
- Support for PHP 5.6, 7.0, and 7.1 has been discontinued. If you are running one of those versions, you MUST upgrade PHP before installing or upgrading to WP Mail SMTP v3.8. Failure to do that will disable WP Mail SMTP functionality.

### Added:
- New Zoho region: Japan.
- Email Log Importer for the WP Mail Logging plugin.
- Ability to search email logs by specific error message or source.

### Changed:
- Email Reports default order. New default order by total.
- Updated Moment.js library to 2.29.4.
- Removed unneeded sodium_compat library.
- Improved Email Reports page user experience.

### Fixed:
- Email Reports date dropdown style in Firefox browser.
- Pro plugin deactivating on WP Multisite installation (network level) if lite plugin is active on a subsite.
- Email address with apostrophes in the Email Test page.
- License-related notices displayed for non-admin users.
- Review request notice display on subsites admin area in WP Multisite installation.
- Email logs attachments and tracking data remove on scheduled email logs cleanup.
- Email Alerts sending when "Do Not Send" option is enabled.
- Redirection to Setup Wizard on multisite installations with the global network-wide option enabled after plugin activation on the subsite.
- Setup Wizard playing UA anthem for certain WP sites.

### Added:
- Backup Connection. Allows to set a Backup Connection which will send the email, if the Primary Connection fails.
- Smart Routing. Send emails from different additional connections based on your configured conditions.
- Additional Connections. Allows configuring additional mailers that can be used as a Backup Connection or in Smart Routing.

### Changed:
- Improved Action Scheduler data cleanup on plugin uninstall.
- Improved performance for database table's validation checks.

### Fixed:
- Tasks meta database table error.
- Gmail mailer authorization error if the oAuth app already had other non mail scopes attached.
- Email address validation in Setup wizard.
- Removed unneeded composer libraries autoload code.
- Conflict detection for plugin Sendinblue - WooCommerce Email Marketing (v3.0+)

### Fixed:
- Setup Wizard steps navigation, when going backwards.