PHP Error with email verify on

After Sign Up in Auth0 lock widget see:

Deprecated: Non-static method WP_Auth0_Api_Client::convertCertToPem() should not be called statically in /var/www/domain.com/public/htdocs/wp-content/plugins/auth0/lib/WP_Auth0_Api_Client.php on line 1079
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I changed line 1042 of WP_Auth0_Api_Client.php to add the static keyword to read:
protected static function convertCertToPem($cert) {

Hoping this post will result in fix by author.