fix: 🐛 new React behaviour needs useState to set something

Issues: closes #128

Author: streamich

src/__stories__/useGetSet.story.tsx

@@ -32,9 +32,9 @@ const DemoWrong = () => {
 
 storiesOf('State/useGetSet', module)
   .add('Docs', () => <ShowDocs md={require('../../docs/useGetSet.md')} />)
-  .add('Demo', () =>
+  .add('Demo, 1s delay', () =>
     <Demo/>
   )
-  .add('DemoWrong', () =>
+  .add('DemoWrong, 1s delay', () =>
     <DemoWrong/>
   )

src/useUpdate.ts

@@ -1,5 +1,8 @@
 import {useState} from 'react';
 
-const useUpdate = () => useState(0)[1] as (() => void);
+const useUpdate = () => {
+  const [, setState] = useState(0);
+  return () => setState(cnt => cnt + 1);
+};
 
 export default useUpdate;