Readme updates

[ZevEisenberg]

Fixes #339, plus one other minor fix for something that's been bothering me. @thisisjeffwong I'd appreciate a review of this, if you have time.

[ZevEisenberg]

Code I used to generated this, in case its useful to someone, including me from the future:
Dynamic Type Research.zip

[raizlabs-oss-bot]

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📖	Test Results
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Current coverage for BonMot.framework is 82.66%

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[thisisjeffwong]

The graph shows most of the styles not growing in the larger accessibility sizes. However, I noticed that they still do when looking at the Apple typography docs.

I'm not sure which is correct though it doesn't make sense to me why they would have some sizes simply not grow.

I didn't notice the discrepancy before when I filed the ticket.

[thisisjeffwong]

See my comment here: #340 (comment)

[ZevEisenberg]

I only updated the two new sizes. I guess I should update all the sizes, just in case they’ve changed. I really should throw together a script that can do this all via a graphing library or something.

[cjamie]

can we also include changing the struct Constants in this PR to enum Constants since its more appropriate as a namespace

[ZevEisenberg]

@cjamie which constants are those? I don’t think it’s related to this PR; would you mind opening a new PR or issue with more detail?

[cjamie]

@ZevEisenberg the ones in the readme