Doesn't work in Edge, IE, or Safari due to lack of SharedWorker

[nolanlawson]

Edge, IE, and Safari don't support SharedWorker right now: http://caniuse.com/#feat=sharedworkers

When you try to load this library in those browsers, you'll see an error because SharedWorker is undefined. Here's a repro: http://bl.ocks.org/nolanlawson/raw/28af65df06818b6d4000891714865bc8/

You might want to make SharedWorker optional or look into something like Polymer's CommonWorker instead. Or at least document it. 🙂

[Wildhoney]

Thanks for this @nolanlawson 👍 I've pushed a small change that should provide a graceful fallback for unsupported workers.

[Wildhoney]

Added to README as well.