Added react-dom as a peer dependency

[shinonomeiro]

Issue: facebook/react#10320

I've simply added react-dom as a peer dependency, which for some reason wasn't (but react is). This did solve the problem for my company's project codebase.

I don't know if some other internal compatibility issues might arise due to specific conditions that I cannot possibly test. I do hope for full support of React v16 from the authors though.

[gary-menzel]

It is not a dependency because it is not required by React-Table. React-Table is deliberately "minimal dependency".

From the issue you linked, it appears to be more of an issue with recent version changes between React and React-Dom.

[shinonomeiro]

It is a dependency, albeit a 'peer' one as obviously React-table would be useless without React. I don't understand why React is listed in peerDependencies yet React-dom isn't, although both libraries form a pair and are always updated simultaneously. Most other libraries which encountered this very issue solved it the same way I did in this pull request.

Per the devDependencies listed in package.json (https://github.com/react-tools/react-table/blob/master/package.json#L72), React-dom is locked to v15.4.2 while React itself is allowed to be updated to v16.x.x as listed under peerDependencies, which may result in a version mismatch since npm would have to give React-table its own (outdated) copy of React-dom.