Feature branch for SDK 2.2.0

CHANGELOG.md

@@ -6,9 +6,35 @@ and this library adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+This release adds several important new features:
+- Currency exchange rates (currently just USD/ZEC) are now made available via the SDK.
+  The exchange rate computed as the median of values provided by at least three separate
+  cryptocurrency exchanges, and is fetched over Tor connections in order to avoid leaking
+  the wallet's IP address to the exchanges.
+- Sending to ZIP 320 (TEX) addresses is now supported. When sending to a ZIP 320 address,
+  the wallet will first automatically de-shield the required funds to a fresh ephemeral 
+  transparent address, and then will make a second fully-transparent transaction sending
+  the funds to the eventual recipient that is not linkable via on-chain information to any 
+  other transaction in the  user's wallet.
+- As part of adding ZIP 320 support, the SDK now also provides full support for recovering
+  transparent transaction history. Prior to this release, only transactions belonging to the
+  wallet that contained either some shielded component OR a member of the current
+  transparent UTXO set were included in transaction history.
+
+### Changed
+- Migrated to Rust 1.80.0.
+- `Synchronizer.proposeTransfer` now supports TEX addresses (ZIP 320).
+- Internal transactions-enhancing logic has changed to support the history of transactions made to TEX addresses 
+
 ### Added
+- `Synchronizer.isValidTexAddr` which checks whether the given address is a valid ZIP 320 TEX address
+- `Synchronizer.exchangeRateUsd` is a `StateFlow` containing the latest USD/ZEC
+  exchange rate, along with the `Instant` it was fetched. It can be initialized
+  and refreshed by calling `Synchronizer.refreshExchangeRateUsd()`.
+- `ZatoshiExt.toFiatString` is now a public function
 - `Synchronizer.getFastestServers([LightWalletEndpoint])` is a flow that measures connections to given endpoints and
   returns the three fastest ones
+- `Synchronizer.getTAddressTransactions` returns all the transactions for a given t-address over the given range
 
 ## [2.1.3] - 2024-08-08