Deprecated code — plugin triggers PHP Notice

Plugin triggers this PHP notice

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead

https://wordpress.org/plugins/easy-columns/

Actually, another support post provides a fix, but it requires editing the plugin file.
https://wordpress.org/support/topic/has_cap-was-called-with-an-argument-that-is-deprecated-2