When "Title & Meta Optimization " is active, got deprecated warning on PHP 7

After activating the "Title & Meta Optimization" option of the SmartCrawl-plugin, 2 deprecated warnings showed up on every page in de WP-admin:

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; WDS_Metabox has a deprecated constructor in ../public/wp-content/plugins/wpmu-dev-seo/wds-files/wds-core/admin/wds-core-metabox.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; WDS_Taxonomy has a deprecated constructor in ../public/wp-content/plugins//wpmu-dev-seo/wds-files/wds-core/admin/wds-core-taxonomy.php on line 3

I'm using PHP 7