Fix Combobox filtering with custom itemToString

[colinking]

Fixes: #215

If you supply an itemToString to an Autocomplete / Combobox, we will now correctly fuzzy filter on the string values.

Before	After

[Rowno]

Why did you change this? prepublishOnly is an npm lifecycle hook that makes sure evergreen is rebuilt automatically when people publish.

[colinking]

Yep, so is prepare :) https://docs.npmjs.com/misc/scripts#description

I wish npm had a separate object for lifecycle hooks (lifecycle: { prepare: ... }), so that this is less so black magic 😬

But from the docs (prepare is a superset of prepublishOnly):

prepare: Run both BEFORE the package is packed and published, on local npm install without any arguments, and when installing git dependencies (See below). This is run AFTER prepublish, but BEFORE prepublishOnly.
prepublishOnly: Run BEFORE the package is prepared and packed, ONLY on npm publish. (See below.)

Admittedly, I forgot this was still here -- I was mainly using it for testing in another repo. But in general, this hook builds evergreen when you add it as a dependency, which allows you to reference a git branch (f.e. "evergreen-ui": "segmentio/evergreen#colin/item-to-string-autocomplete",). It's pretty useful for testing a branch like this out in a production setting.

However, not really sure if we want to include this change since it may slow down install times.

[colinking]

Reverting this change and dismissing the review so I can ship this :)

Reverted the package.json change

[colinking]

Merged master + double-checked that all storybook entries for Autocomplete and Combobox worked.