Update to React 16

[felixfbecker]

This warning gets printed when you install react-visibility-sensor in a project that uses React 16:

npm WARN react-visibility-sensor@3.10.1 requires a peer of react@^0.14.0 || ^15.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN react-visibility-sensor@3.10.1 requires a peer of react-dom@^0.14.0 || ^15.0.0 but none is installed. You must install peer dependencies yourself.

It seems to work fine though

[robin-anil]

+1

[joshwnj]

thanks @felixfbecker & @stevewillard .

published to v3.11.0