This PR adds support for a suspense option to the useFetch hook.

import { useFetch } from 'use-fetch-hooks';

const Child = () => {
  const { data } = useFetch('https://example/api', { suspense: true });

  return <div>{data}</div>;
};

const Parent = () => (
  <React.Suspense fallback="Loading...">
    <Child />
  </React.Suspense>
);

A few notes:

• react-cache (the default cache container maintained by the React team) is still unreleased, in major flux, and currently in a broken state, so I had to build an old version and check it into the repo for now
• Using suspense and lazy together is not yet possible with react-cache (without some nastiness), so useLazyFetch has no suspense option yet

Other unrelated things:

• Disabled react/prop-types as we'll be adding TypeScript soon and won't have a need for prop types
• Added import/resolver setting so importing external dependencies (like react) don't throw lint errors
• Enabled source maps in example app
• Created Container component for example implementations

Closes #6