Remove object-assign

[ponelat]

remove object-assign dep ( which was missing from package.json )

revert to older react version, may break editor

Don't merge this until swagger-editor (insert-pr-here) is merged

[shockey]

Added WIP to title. @ponelat ping me when the corresponding editor PR is ready 😄

[ponelat]

@shockey too much effort to downgrade react across it. Went with another solution for my particular need.
Made this PR about the object-assign thing only ( renamed title, to match ).
Should be good to merge. Not sure how this worked before... since the package.json didn't include any reference to object-assign package.

[shockey]

@ponelat merge conflict, please fix, i'm not able to add commits to your branch 😄

[ponelat]

hello dist/ fol-der my friend....
I've come to re-compile again.

In restless issues we walked alone
Narrow streets of cobble-stone

'Neath the halo of a merge-conflict
I turned my collar to the cold and damp
When my eyes were stabbed by the flash of a notification

That split the night
And touched the sound of compiling