message: [client] fix up rust-wallet broken link
diff: @@ -6,7 +6,7 @@ Libra Wallet is a pure-rust implementation of hierarchical key derivation for Se
  `libra_wallet` is a library providing hierarchical key derivation for SecretKey material in Libra. The following crate is largely inspired by [`rust-wallet`](https://github.com/rust-bitcoin/rust-wallet) with minor modifications to the key derivation function. Note that Libra makes use of the ed25519 Edwards Curve Digital Signature Algorithm (EdDSA) over the Edwards Cruve cruve25519. Therefore, BIP32-like PublicKey derivation is not possible without falling back to a traditional non-deterministic Schnorr signature algorithm. For this reason, we modified the key derivation function to a simpler alternative.
  -The `internal_macros.rs` is taken from [`rust-bitcoin`](https://github.com/rust-bitcoin/rust-bitcoin/blob/master/src/internal_macros.rs) and `mnemonic.rs` is a slightly modified version of the file with the same name from [`rust-wallet`](https://github.com/rust-bitcoin/rust-wallet/blob/master/wallet/src/mnemonic.rs), while `error.rs`, `key_factor.rs` and `wallet_library.rs` are modified to present a minimalist wallet library for the Libra Client. Note that `mnemonic.rs` from `rust-wallet` adheres to the [`BIP39`](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) spec.
  +The `internal_macros.rs` is taken from [`rust-bitcoin`](https://github.com/rust-bitcoin/rust-bitcoin/blob/master/src/internal_macros.rs) and `mnemonic.rs` is a slightly modified version of the file with the same name from [`rust-wallet`](https://github.com/rust-bitcoin/rust-wallet/blob/master/src/mnemonic.rs), while `error.rs`, `key_factor.rs` and `wallet_library.rs` are modified to present a minimalist wallet library for the Libra Client. Note that `mnemonic.rs` from `rust-wallet` adheres to the [`BIP39`](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) spec.
  # Implementation Details
  