Zecwallet

This release of zecwallet-light-cli improves the wallet recover functionality that can help you recover from corrupted wallets.

Running `zecwallet-light-cli --recover` can now attempt to recover your wallet seed and restore your wallet for rescanning.

This is a small upgrade to the lightclient CLI that improves the wallet.dat format to be compressed, improving performance.

Thanks to a Zcash Foundation grant, Zecwallet's lightwalletd server is now bigger, and able to cache ALL blocks, improving sync performance for lightclients.

This release also switches the underlying GRPC library to tonic.

- Added integer parsing with Decimal, for consistency

This version of `Zecwallet-cli` contains pre-built binaries for ARMv7 and AARCH64. Use zecwallet-cli lightclient on Raspberry Pi v2 and v3!

Additional bugfixes include:
- Handle pending transactions in mempool properly.
- Sync fixes to prevent deadlocks
- Several small formatting and display fixes.

*Zecwallet-CLI now supports encrypted wallets!*

Encrypted Wallets
Zecwallet-CLI can now encrypt your wallet, protecting your private keys while stored on disk and in memory.

When a wallet is encrypted, Zecwallet-CLI will use your viewkeys to download new transactions and keep up with the blockchain. To spend money from the wallet, you can unlock your wallet, spend money, and then lock it up again.

When a wallet is encrypted:
* Private keys for both z and t addresses are encrypted, both on disk and in memory
* Receive ZEC on both z and t addresses like normally. You can check your balance and transaction history
* Unlock is needed to spend money from the wallet.

Bip39 Bug
This release also contains a fix for a address derivation bug that derived non-standard addresses for z and t addresses after the first one. Zecwallet-CLI contains a new command `fixbip39bug` that can automatically correct your wallet's addresses. No funds are at risk.

More details: https://github.com/adityapk00/zecwallet-light-cli/blob/master/bip39bug.md