PHP 7.0 throws error due to private constant in JwplatformAPI.php line 13

13:  private const urls = [

This throws an error in PHP 7.0: PHP Parse error:  syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in .../vendor/jwplayer/jwplatform/src/JwplatformAPI.php on line 13

Removing "private" fixes the problem