Add ethereum-cryptography to walletlink-connector package.json

[dante-robinson]

When installed with
"@web3-react/core": "^6.1.9", "@web3-react/injected-connector": "^6.0.7", "@web3-react/portis-connector": "^6.2.11", "@web3-react/walletconnect-connector": "^6.2.13"

using NextJS

I get an error saying that 'node_modules/ethereum-cryptography/node_modules/keccak/js.js' file is missing. It is fixed once adding 'ethereum-cryptography' manually and remains fixed even if I manually remove 'ethereum-cryptography' afterwards. I assume adding this dependency would fix this issue in the future.

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[grabbou]

Hey, Thanks for the PR but V6 is no longer actively maintained and we're not accepting PRs against it. Mike