Remove CommonJS call
Remove CommonJS call

Because of this: rollup/rollup-plugin-commonjs#96 Glamor's es6 build isn't importable into a Rollup build. Just ran into this now.

This should fix things up, and also better follows the [unambiguous grammar proposal](https://github.com/nodejs/node-eps/blob/master/002-es6-modules.md#51-determining-if-source-is-an-es-module). (Yes, I know they're going with .mjs, but this still fits with the right spirit of the spec)
threepointone/glamor,threepointone/glamor