Production build does not work for Safari 10 due to Safari bug. Fix available.

Created by: satyavh

There's a bug in Safari 10, it throws on uglified code https://bugs.webkit.org/show_bug.cgi?id=171041

There's a fix as well, but Create React App does not implement the fix https://github.com/mishoo/UglifyJS2/tree/harmony#mangle-options

The result is that it is very likely that a production build created by npm run build does not run on Safari. At least ours does not (mvp.giveth.io)

How to update the uglify settings?