Upgrade npm package dependencies

[PeterDaveHello]

Most of the devDependencies were dated, ref: https://david-dm.org/notatestuser/gift?type=dev

@notatestuser maybe we should dropped end-of-life nodejs versions like v0.10 & v0.12?

[PeterDaveHello]

@notatestuser maybe we should dropped end-of-life nodejs versions like v0.10 & v0.12? I doubt if modern packages still supports nodejs > 0.4 < 0.12, maybe we can bump the nodejs engine in package.json and .travis.yml to drop the deprecated versions?

[notatestuser]

I agree but dropping old node would be more suitable for a v1.0 release. Does updating dev dependencies make the tests break on those versions?

[PeterDaveHello]

I think it passed the tests on all versions after v4, the issue here is we can't run the test, not the test failed.

Not only mocha but also sinon uses supports-color which needs nodejs >4.0

Not sure what's the version bumping policy here, I think the old dependencies stocked too long, so maybe it's the chance to bump to v1.0.0? (During a long time from the previous release)

BTW, I don't think it means it breaks the using on old versions, just can't run test on them, and it won't violate what the readme says test on all stable versions :)

[PeterDaveHello]

@notatestuser sure thing!

[notatestuser]

Actually I'll do it, no worries. Thanks again!

[PeterDaveHello]

Oops ... I just pushed one second later ...

[PeterDaveHello]

@notatestuser and I think node in package.json should be updated to >4 please.