Echo JS 0.11.0

Most modern browsers support async, and have fetch. It would be better to convert to commonjs imports, without the use of corejs or regenerator... also, may be best for a specific browser version to only polyfill sha1 and another using crypto for node.

Alternatively: https://www.npmjs.com/package/sha1

Added an Issue with working code using the `sha1` module without the babel polyfills, axios etc... too much overhead.  Can polyfill fetch and Promise for IE support all modern browsers covered and the payload won't be the 138kb it currently is.

Thank you so much for the feedback! I'll look into streamlining it.