Bundles babel-runtime unnecessarily

[tinder-vjancik]

This is a small library, you are bundling with it babel-runtime and distributing it through npm.

The babel-runtime bloats the size of this library to:
Unminified: 67kB
Minified: 25kB
Gzipped: 8kB

Could you please polyfill selectively? babel-runtime is a huge dependency.
You don't seem to use that many non ES5 functionality anyway.

[tinder-vjancik]

I actually can't find a single primitive, in need of polyfilling, in your 3 code files.
Removing babel-runtime reduces the library size to 19kB

[tinder-vjancik]

Implemented here: #78

[yocontra]

Thanks!