Warning: Promise.defer is deprecated

[okamoai]

Environmet:

• Windows 10
• Node.js 12.14.1

Running postcss-lazysprite gives a warning. Warning: Promise.defer is deprecated and will be removed in a future version. Use new Promise instead.

Promise.pending() seems to be the cause.

• https://github.com/petkaantonov/bluebird/issues/919
• https://github.com/petkaantonov/bluebird/commit/d8e903a4140b16a787f6b62cf1dc44c1fd894956
• http://bluebirdjs.com/docs/anti-patterns.html#the-explicit-construction-anti-pattern