Unnecessary dependencies from fbjs

[Taylor123]

Is it necessary for this package to be dependent on all of fbjs? I understand that it can make things easier for development, but I ran into an issue due to fbjs' dependency on isomorphi-fetch.

For the issue i ran into, see matthew-andrews/isomorphic-fetch#125

[the-spyke]

A have a similar issue, but with core-js:

└─┬ prop-types@15.6.1
  └─┬ fbjs@0.8.17
    └── core-js@1.2.7 

Even if all my other packages depend on core-js@2.x, npm continues to put core-js@1 from fbjs into the root node_modules, what leads to missing polyfills.

[ljharb]

fbjs is no longer a dependency of this package.