Add support for package.json "module" prop
This is a largely minor release but we've added support for the "module" property in package.json
鈥搒ee #805.
Bumping a minor version to make sure people's builds don't break with the new property.
If you are experiencing build errors with webpack after upgrading, try changing your mainFields
webpack config: #805 (comment) (thanks to @brettz9 for the tip!)