composer says: Package drupal/draggableviews at version dev-8.x-1.x has a PHP requirement incompatible with your PHP version (7.0.26.0)

You can not " composer require drupal/draggableviews:8.1.x-dev " because of the error message:

/var/www/html $ composer require drupal/draggableviews:8.1.x-dev
    1/1:	http://packagist.org/p/provider-latest$590926b56a3047afd6823cc84380e1592680675eaccf72441975668bef71977c.json
    Finished: success: 1, skipped: 0, failure: 0, total: 1
  [InvalidArgumentException]                                                                                              
  Package drupal/draggableviews at version 8.1.x-dev has a PHP requirement incompatible with your PHP version (7.0.26.0)  

Don't know where it is coming from, but possibly somewhere php is constrained to '7.0' instead of '^7.0' ? ( or '^7' even?) I am using php version 7.0.26 (according to the php -v command )