update changelog

Author: kaya70875

CHANGELOG.md

@@ -6,8 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 ### Added
+- Add `PlaylistFetcher` for CLI and Python API.
+- Add metadata choosing option for **CLI**.
+- Add `no-timing` argument for CLI for not choosing transcript timings.
+- Full url support for `PlaylistFetcher` and `ChannelFetcher`.
+
 
 ### Changed
+- Exporter now exports **all available data** as default.
 
 ### Fixed
 ---