StreamSaver writes stream to the filesystem directly asynchronous
Full Changelog: https://github.com/jimmywarting/StreamSaver.js/compare/2.0.4...2.0.6
Forces IOS to build blob instead of using streams - dc0c9da, #148
Hopefully this also means chrome, FF and whatever on IOS that can't have a own render engine.
Don't close the messageChannel prematurely
Solved #103