reactUtils utils break enums

If you are reporting a bug or having an issue setting up React Hot Loader, please fill in below. For feature requests, feel free to remove this template entirely.

### Description

What you are reporting:

The utils, after checking if type Object, check for the value of the property $$typeof. However with Enums, access the property before checking it exists throws an error.

### Expected behavior

What you think should happen:

The utils should not cause an exception when checking if matching type.

### Actual behavior

What actually happens:

An error is thrown by the enum.

### Environment

React Hot Loader version:

4.6.3

Run these commands in the project folder and fill in their results:

1. `node -v`:
2. `npm -v`:

Then, specify:

1. Operating system:
2. Browser and version:

### Reproducible Demo

Please take the time to create a new project that reproduces the issue.

You can copy your project that experiences the problem and start removing things until you’re left with the minimal reproducible demo. This helps contributors, and you might get to the root of your problem during that process.

Push to GitHub and paste the link here.

No demo, since this is how enums are supposed to work.

I'll make making PR soon.