Update to readable-stream 3.0.0

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Closes #17
Closes #22
Closes #24

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rs@3 is significantly different in the browser and in node so we probably need some browserified tests here. it also drops support for some browser versions but i think its support is now the same as Buffer's so that's ok.

[3cp]

Anyone reviewing this? readable-stream v3 is now 3.0.6 btw.

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there are still some problems with this unfortunately. i had some runtime crashes involving util.inspect.custom (which IIRC is not yet available in browserify's util)

[arahmanan]

@goto-bus-stop I believe there have been some changes with the use of util.inspect.custom in the more recent versions of readable-stream (starting from v.3.1.0). Do those address the issues you were running into? Let me know if I can help in any way.

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@arahmanan it looks like it! that means this should almost be ready. i requested a saucelabs.com account for browserify so we can add some browser tests, i would like to be a bit more certain about what we support. especially because readable-stream now has slight implementation differences in the browser version and the node.js version for compatibility reasons. once that's set up, this can finally be released :)

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status update: saucelabs approved the request quickly, but I ran into some trouble claiming it. I only just finally emailed them about it, hopefully it can be resolved soon!

[guybedford]

@goto-bus-stop would you consider forking and publishing this update yourself? I'm currently looking into updating these builtins in jspm (https://github.com/jspm/jspm-core) and this would be great to avoid the duplication that now comes into effect since http has upgraded.

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Saucelabs says yes! 📦 stream-browserify@3.0.0

[guybedford]

Amazing, persistence pays off :)