package.json: Allow React 16 as a peer dependency

[rufman]

No description provided.

[codecov]

Codecov Report

Merging #1080 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1080   +/-   ##
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  Coverage   84.09%   84.09%           
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  Files          13       13           
  Lines         874      874           
  Branches      148      148           
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  Hits          735      735           
  Misses         35       35           
  Partials      104      104

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[aij]

Is that all that's really needed?

From some comments on #972 and #1060 it sounds like it might be... I suppose it would at least prevent people from mixing different versions of React, which seems to never go well.

[rufman]

Yeah I tested it on my setup and everything works, except for yarn check which throws a peer dep error. react-popper will need to be updated too once floating-ui/react-popper#59 merges.