Cache busting assets via [hash] or [chunkhash] rather than query parameter

[jeromelecomte-okta]

As I understand, using a query parameter to cachebust assets (e.g. bootstrap.min.css?1337) is the Webpack 1 way. Webpack 2 switched to renaming assets files to include a hash via variable [hash] or [chunkhash] (e.g. 'boostrap.min.[chunkhash].css' becomes boostrap.min.1337.css).

Could you update this plugin to support the use of [hash] and [chunkhash] in the 'entry' field under 'externals'?