@types/react interferes with preact types

[weedz]

I noticed this package uses @types/react-transition-group as a regular dependency which in turn depends on @types/react. @types/react interferes with the JSX types from preact so we get warnings like:

'MenuLink' cannot be used as a JSX component.
  Its instance type 'Component<IMenuLink, {}>' is not a valid JSX element.ts(2786)

Are there any problems with moving @types/react-transition-group into devDependencies? This seems to fix our issue.