CHANGELOG.md

• Adds firebase ext:export command, and adds extensions to firebase deploy. See https://firebase.google.com/docs/extensions/reuse-project-config for more infomation on how to manage your extensions with these commands.
• Fixes issue where init would crash with multiple Hosting items selected (#3742).
• Adds a command (crashlytics:symbols:upload) to upload native symbol files, used in Android NDK crash symbolication.