Update peerDependencies for react > 16

[mikeboyle]

Our team loves this library and we are using v1.0.0 without any issues in a project with react and react-dom ~16.6.0.

However, when installing the package, we are getting warnings because the peerDependencies in package.json is still set to versions of react and react-dom below 16: https://github.com/JedWatson/react-codemirror/blob/c3ae528465bcdc4f20780892f8a9111e785fa577/package.json#L32-L33

It looks like the < 16 restriction was set some time ago in https://github.com/JedWatson/react-codemirror/pull/64/files#diff-b9cfc7f2cdf78a7f4b91a753d10865a2R30 . Is it possible that the library works just fine with react and react-dom > 16, or are there known issues with that version that I have not happened to encounter yet?

If there are no known issues, any objections to opening a PR to adjust the peer dependencies?

[scniro]

@mikeboyle This lib is pretty much abandoned. Check out react-codemirror2.