Update Coinbase.lua

[slauber]

Introduces a list that contains unsupported currencies, starting with REPV2, still need resigning by MoneyMoney's dev

Fixes #7 and #8

[commit-lint]

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slauber

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[mnin]

Hey, I have had email contact with Michael from MoneyMoney regarding this Extension.

He recommended, if I want to sign this version, to fork the repository and integrate your PR.

And would like to continue this extension in my fork https://github.com/mnin/coinbase-moneymoney

Thank you @nicolindemann and @slauber for your work!