Please see upgrade notes:
https://github.com/infernojs/inferno/releases/tag/v6.0.0-rc.0

Fragments.

- Small change in enzyme adapter (render no longer returns anything)
- Rewritten to tree completely to make code more readable and less error
prone.

toTree handles the complete logic of deciding what to do with
which component types (it trusts getNodeType to report the correct type).

getNodeType handles corrections for types and uses types of children &
inferno's flags in order to decide.

Adding or configuring types should be as straightforward as teaching the
later how to properly distinguish this type and the former how to create
an appropriate tree representation based on this.
It takes inspiration from the design of the official react 16 adapter from enzyme.

So it's easier to change their name and their respective node
representation types - which can change across enzyme releases.

To improve extensibility in the future. I would like all methods inside
toTree which either adjust rendered or instance to follow the same
naming scheme as separate (extracted) functions.

Will still need to add tests from official enzyme repo.