v2.1.0

Updated all Babel dependencies up to 7.3.x to fix edge-case errors with let keyword usage, among other fixes.

pack

• Added support for a public directory, where static assets within are copied, at buildtime, to ./dist.
• Added support for process.env.PUBLIC_URL which is hardcode to '.', for consistency with 3rd party standards.

serve

• Added support for serving/watching file contents within ./public.

transpiled

• Fixed --commonjs option not being respected in transpiling process.