loadable-components support!

Major thanks to @neoziro for adding support for the excellent loadable-components library.

You can now use react-loadable-visibility on both react-loadable and loadable-components to make visibility based code loading a reality!

Remove react-dom peer dependency

Also use jest --watch for testing until Jest fixes a few issues on their end. Seems to be this issue however the proposed solution isn't working - jestjs/jest#3995

Initial Release

🌅