Not PHP 7.1 compatible

Site is at siteground and its reporting the following issue with PHP 7.1:

FILE: /home/golemon7/public_html/wp-content/plugins/wp-mail-smtp/vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php
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FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 2 LINES
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65 | WARNING | Function mcrypt_create_iv() is deprecated since PHP 7.1; use OpenSSL instead
65 | WARNING | Extension ‘mcrypt’ is deprecated since PHP 7.1 – use openssl (preferred) or pecl/mcrypt once available instead.
104 | WARNING | Function mcrypt_create_iv() is deprecated since PHP 7.1; use OpenSSL instead
104 | WARNING | Extension ‘mcrypt’ is deprecated since PHP 7.1 – use openssl (preferred) or pecl/mcrypt once available instead.
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