Craft\m160723_000000_seomatic_addSeoMainEntityOfPage::safeUp PHP Method

    public function safeUp()
    {
        // specify columns and AttributeType
        $newColumns = array('seoMainEntityOfPage' => ColumnType::Varchar);
        $this->_addColumnsAfter("seomatic_meta", $newColumns, "metaPath");
        // return true and let craft know its done
        return true;
    }