Missing options in `emotion/packages/cache/README.md

[simondriesen]

What: Not all @emotion/cache options are listed in the README.

Why: I was looking for an option that does exactly what insertionPoint does but it wasn't listed in the README. I had to look into the emotion code itself to find out about it's existence. I think it should be mentioned in the README.

How: Just updated README.md text (with explanation based on CHANGELOG.md logs and comments by developers).

Checklist:

• [x] Documentation
• [ ] Tests "N/A"
• [ ] Code complete "N/A"
• [ ] Changeset "N/A"

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Latest commit: a1dfb2bb607e1b9e00bf1673dfd2da392535fe5e

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