Remove large (+20kb) 'change-case' dependency

[wilsonpage]

Fixes #623

[vercel]

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[johno]

🏅

[ChristianMurphy]

@wilsonpage would focusing the npm package to https://github.com/blakeembrey/param-case reduce the bundle size, and keep the edge case handling?

[johno]

@ChristianMurphy at this point we shouldn't need any edge case handling since we're only transforming two known cases.

[wooorm]

This may not work for node.properties.data123 = '???'. DOM (and hast) represents data-123 as that, so there’s no uppercase to change. I’m guessing this change’ll break that. May need a test?

ARIA is a list of know values which don’t have numbers, so that’s fine.

[timneutkens]

Updated the pr description to auto-close the issue.

[wilsonpage]

@ChristianMurphy param-case still depends on the large dependency no-case.

[wilsonpage]

Updated the PR to cope with the data123 case.

[ChristianMurphy]

Looks good

May need a test?

@wilsonpage any chance a test case could be added to verify the handling node.properties.data123?
So that use case is documented in code.

[wilsonpage]

@ChristianMurphy I'm afraid I don't have enough context on this project to write a test. Would take me a while to grok, which I can't afford right now :( Would be great if one of you lot could add one!

[johno]

I'll add a few tests in a follow up PR, thanks for the contribution @wilsonpage!