Fix plugin id in README.md about kotlincocoapods HOT 4 OPEN

Also, before I could make it work for an existing project, I had to update podspec file as in here https://github.com/touchlab/KaMPKit/pull/76/files#diff-65c1831fff220b3ed58c09539ba5f0ec:

and reinstall pod.

Perhaps it's worth including some of it in README.md

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And here another issue in README.md

isStatic = false

must be

framework {
            isStatic = false
}

/cc @ben-whit-ley

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@alekseychugaev you don't need to modify the podspec file, you could generate it with the gradle task provided you set

framework {
            isStatic = false
}

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Acknowledging yes we could use a docs refresh here.

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