Update peer dependencies

[hassaans]

npm WARN react-read-more-less@0.1.3 requires a peer of react@^15.5.4 but none is installed. You must install peer dependencies yourself.

[blaiz]

I'm getting warning " > react-read-more-less@0.1.6" has incorrect peer dependency "react@^15.5.4". with yarn. I'm using the latest React, which is ^16