Browserify: Upgrade acorn in dependencies

[timwis]

I was hoping to use async/await now that it's fully supported by Chrome (without browser flags), but browserify was giving me a syntax error. @pluma helped point me to acorn and the various dependencies that depend on it. I've submitted pull requests to upgrade the acorn version used by all the node-browserify dependencies I could find.

• substack/astw#10
• substack/browser-unpack#15
• substack/node-detective#67
• substack/node-syntax-error#18

npm test passes in all repos. Let me know if I missed one and I'm happy to submit another PR.

[martinwebrant]

Note that ecmaVersion default to 7(2016) in acorn and that some packages like detective gives it's own default 6(2015) instead of acorns. You need 8(2017) for async/await.

[pfrazee]

Can we get this merged?

[substack]

Everything is up to date. On a clean install of browserify you should be able to use async/await.

[timwis]

Verified! Thanks :)