Deprecated dependencies

[stur86]

Installing the package warns me of the following issues:

npm WARN deprecated [email protected]: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm WARN deprecated [email protected]: core-js@<3.3 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Please, upgrade your dependencies to the actual version of core-js.

These both appear to be caused by msdf-bmfont-xml depending on a very old version of jimp (0.6.8 where current is 0.16.1). Is there any chance of fixing this and pushing the fix version to NPM?