Add compapility with core-js@3.x

[mhp-borisbojic]

Hi,

Fuse works perfectly for me in a vue-based project, but just as long as I use the package core-js@2.6.9 ... with the latest 3.x release it just throws an error:

This dependency was not found:
* core-js/modules/es6.regexp.search`

It's because of the following changes:

Move all features from ES5, ES2015, ES2016, ES2017, ES2018 and ES2019 to one namespace for stable ES - it's available as core-js/es, all those features in modules folder has es. prefix.

Change prefix for ES proposals from es7. to esnext., they no longer available in core-js/es7, use core-js/stage/* instead of that.

[github-actions[bot]]

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