docs: add changelog entries

CHANGELOG.md

@@ -7,10 +7,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ## [4.2.0]
-### Uncategorized
-- Add key derivation options support ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+### Added
+- Added `EncryptionKey` type to hold a `CryptoKey` along with its derivation parameters ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added `ExportedEncryptionKey` type to hold a `JsonWebKey` along with its derivation parameters ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added Optional `keyMetadata` property of type `KeyDerivationOptions` to `EncryptionResult` ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added Optional `opts`  argument to `keyFromPassword` to specify algorithm and parameters to be used in the key derivation. Defaults to `PBKDF2` with 900.000 iterations ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added `iterations` argument to `keyFromPassword` function ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added optional `keyDerivationOptions` argument to `encrypt` and `encryptWithDetail` to specify algorithm and parameters to be used in the key Defaults to `PBKDF2` at 900.000 iterations ([#49](https://github.com/MetaMask/browser-passworder/pull/49)).
+- Added `updateVaultWithDetail` function to update existing vault and exported key with a safer encryption method if available ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- Added `updateVault` function to update existing vault string with a safer encryption method if available ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+
+### Changed
+- `encrypt` method accepts both `EncryptionKey` and `CryptoKey` types as `key` argument ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- `encryptWithKey` method accepts both `EncryptionKey` and `CryptoKey` types as `key` argument ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- `decrypt` method accepts both `EncryptionKey` and `CryptoKey` types as `key` argument ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- `decryptWithKey` method accepts both `EncryptionKey` and `CryptoKey` types as `key` argument ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- `importKey` method returns a `CryptoKey` when a JWK string is passed, or an `EncryptionKey` when an `ExportedEncryptionKey` string is passed. ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
+- `exportKey` method accepts both `EncryptionKey` and `CryptoKey` types as `key` argument, and returns an `ExportedEncryptionKey` for the former and a `JsonWebKey` for the latter. ([#49](https://github.com/MetaMask/browser-passworder/pull/49))
 - chore: pin typescript minor version ([#50](https://github.com/MetaMask/browser-passworder/pull/50))
-- Update CODEOWNERS ([#47](https://github.com/MetaMask/browser-passworder/pull/47))
 
 ## [4.1.0]
 ### Changed