Update object-assign to 4.0

[danez]

4.0 improved the performance a lot, and the ordering might change a bit, but by looking at the code, I think the order is not important for react-themable.

https://github.com/sindresorhus/object-assign/releases

@markdalgleish

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #7 into master will not change coverage

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[theobat]

It would be great to merge this !

[thibaudcolas]

Considering support for ES6 Object.assign is quite good (everything except Node v4 and below, IE11 and below), I'd even suggest dropping that dependency and instead simply mention in the README that people who want to support IE will need to polyfill.

It's not a big deal either way, but right now with the outdated dependency it makes it more tempting than it should be to inline the code.

[sidoruk-sv]

Any progress on this?

Slightly annoying warning on my project:

Multiple versions of object-assign found:
4.1.1 ./~/object-assign
3.0.0 ./~/react-themeable/~/object-assign

[JoshuaRogan]

Same issue as @sidoruk-sv. Would love to see this merged

[wdh2100]

Same issue as @sidoruk-sv.

[HenningThiemann]

Hi @markdalgleish ,

just checking in. It would be great, if you could merge this PR. The old object-assign version is causing troubles in some of my projects.

[sidoruk-sv]

ping