Move react as peerDependency

First of all great work on this package.

I have come across an issue of multiple react installations. This was not a problem during development and bundling for production but more in testing. The tests just fail when run in combination with Create React App with an error saying that there may be more than once installations of react. I did npm ls react at root level and found that is the case:

components@1.0.0 components
├─┬ media-gallery@1.0.1 -> components/src/packages/media-gallery
│ └─┬ react-image-gallery@0.8.18
│   └── react@16.9.0
└── react@16.9.0

I think moving react to be as a peerDependency would resolve this or similar problems. This obviously be a breaking change so would require a major release in case it goes ahead.

Let me know what you think. Cheers

[xiaolin]

released in v0.9.0

[xiaolin]

@jabranr Thanks, I reviewed your pr and the changes shouldn’t be breaking. If you can tweak the pr I can merge.