Triggers install errors with Node 12 & 13

[Mattsi-Jansky]

Watchify is using an old version of Chokidar which in turn is using an old version of FSEvents that causes the following issue during dependency install: fsevents/fsevents#278

This would probably be resolved by #371

[ThisIsMissEm]

This issue currently causes grunt-browserify installs to log a nasty error message to the console, during install; Which in turn affects openpgpjs

[tybro0103]

I've been holding out on switching to webpack, but damn...

[smhg]

@goto-bus-stop please let us know if/how we can help. A browserify setup (which includes watchify) is so much more maintainable than webpack.

[sseide]

add pr #378 with newer chokidar version as well as corresponding anymatch update that should fix it as well.
Main problem here with newer chokidar version seems to be the minimum Nodejs 8.x (EOL) requirement?!?

[goto-bus-stop]

should be good in 📦 4.0.0, thanks for the reports & PRs!