README: Amend complimenting libraries

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Add

• [x] https://github.com/bitcoinjs/bip69
• [x] https://github.com/bitcoinjs/bip66
• [x] https://github.com/bitcoinjs/bip39
• [x] https://github.com/bitcoinjs/bip21
• [x] https://github.com/bitcoinjs/bip38
• [x] https://github.com/bitcoinjs/bip32-wallet
• [x] https://github.com/bitcoinjs/bs58check
• [x] https://github.com/bitcoinjs/bip32-utils

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Added in https://github.com/bitcoinjs/bitcoinjs-lib/pull/468