Update MenuItem label propType to node

[Johnsel]

Hi everyone,

I have made this change to allow the label to be filled with some React component as well, in my case I needed to put in a "FormattedMessage" from the react-intl library to show a potentially translated label.

[codecov-io]

Current coverage is 92.87% (diff: 100%)

Merging #373 into master will not change coverage

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[levithomason]

Heads up, @awei01 is working on revamping the Menu API entirely (#319) to meet our v1 component API pattern (#269).

We can merge this for now though, but we should probably go ahead and use:

label: PropTypes.node,

Which is valid for string, number, React component, or regular DOM node.

[Johnsel]

Cool, I did not know that. Will you make the change?

[levithomason]

I'll merge it, but I don't have rights to your fork. Easy win contribution if you like to push the update :)

[Johnsel]

Sure, thanks. One minute please...

[levithomason]

Thanks much!

[awei01]

@levithomason Hi. Sorry, but I won't be able to take on Menu. I've been sidetracked onto other projects.

[levithomason]

It happens, thanks for the update @awei01.