Describe the bug
A nested ForwardRef is not recognized as a valid component when I do shallow dive() to it.

To Reproduce
Steps to reproduce the behavior:

1. Sample code:

  import * as React from "react";
  import { shallow } from 'enzyme';

  const Component = () => <div/>
  const HOCOne = (WrappedComponent) => React.forwardRef(() => <WrappedComponent/>)
  const HOCTwo = (WrappedComponent) => React.forwardRef(() => <WrappedComponent/>)
  const WithNestedForwarRefComponent = HOCTwo(HOCOne(Component)))
  
  const vDomWrapper = shallow(<WithNestedForwarRefComponent/>);
  

2. Then debug() and dive() vDomWrapper:

  vDomWrapper.debug()
  vDomWrapper.dive()

3. Debug output:
   <ForwardRef(HOCOne(Component)) />
4. See dive() error:
   TypeError: ShallowWrapper::dive() can only be called on components

Expected behavior
A ForwardRef component must be recognized as such and it must be possible to do dive () on it.

Desktop:

• OS: Ubuntu 18.04
• Node: 8.11.3
• Enzyme: 3.6.0
• React: 16.5.0