package.json: add "module" and "esnext" properties (#461)
package.json: add "module" and "esnext" properties (#461)

See https://github.com/dherman/defense-of-dot-js/blob/master/proposal.md for "module" property.
See http://2ality.com/2017/04/transpiling-dependencies-babel.html#proposal-pkgesnext for "esnext" property.
schemastore/schemastore,schemastore/schemastore