v2.1.0

This release makes the switch to using Rollup for building artifacts in the dist folder. The files in dist are mostly similar to previous releases:

• routerrouter.js is an uncompressed browser-suitable UMD file,
• routerrouter.min.js is a compressed version of routerrouter.js, and
• routerrouter.es.js is an uncompressed ES6-compatible module file.

For development purposes, there are a few new or changed commands that can be run:

• npm run build will use Rollup to build files to dist,
• npm start will use Rollup to build files to dist when changes to src/routerrouter.js are made, and
• npm test now uses npm-run-all to more efficiently run the various test scripts.

🎉