swap to babel-preset-env #144
                
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Hey, I noticed vue-toasted is still using the babel-preset-2015.
Babel seems to be recommending to use babel-preset-env and relying on browserslist to figure out what features needs to be transpiled.
I've also set
builtInstousageso polyfills withcore-jsare automatically added in. This way polyfills don't need to be manually added (related to #143)Not sure what is recommended for library authors in regards to core-js polyfills actually. I can look into this later if you like?
node-sass was also failing to build for me (on NodeJS 12), that's why I upgraded it.