# Unreleased
- Fixed an issue where Messaging wouldn't properly unswizzle swizzled delegate
  methods. (#1481)

# 2018-07-10 -- v3.0.3
- Fixed an issue that client should suspend the topic requests when token is not available and resume the topic operation when the token is generated.
- Corrected the deprecation warning when subscribing to or unsubscribing from an invalid topic. (#1397)
- Removed unused heart beat time stamp tracking.

# 2018-06-12 -- v3.0.2
- Added a warning message when subscribing to topics with incorrect name formats.
- Silenced a deprecation warning in FIRMessaging.

# 2018-05-29 -- v3.0.1
- Clean up a few deprecation warnings.

# 2018-05-08 -- v3.0.0
- Remove deprecated delegate property `remoteMessageDelegate`, please use `delegate` instead.
- Remove deprecated method `messaging:didRefreshRegistrationToken:` defined in FIRMessagingDelegate protocol, please use `messaging:didReceiveRegistrationToken:` instead.
- Remove deprecated method `applicationReceivedRemoteMessage:` defined in FIRMessagingDelegate protocol, please use `messaging:didReceiveMessage:` instead.
- Fix an issue that data messages were not tracked successfully.

# 2018-04-01 -- v2.2.0
- Add new methods that provide completion handlers for topic subscription and unsubscription.

# 2018-02-23 -- v2.1.1
- Improve documentation on the usage of the autoInitEnabled property.

# 2018-02-06 -- v2.1.0
- Added a new property autoInitEnabled to enable and disable FCM token auto generation.
- Fixed an issue where notification delivery would fail after changing language settings.

# 2017-09-26 -- v2.0.5
- Added swizzling of additional UNUserNotificationCenterDelegate method, for
  more accurate Analytics logging.
- Fixed a swizzling issue with unimplemented UNUserNotificationCenterDelegate
  methods.

# 2017-09-26 -- v2.0.4
- Fixed an issue where the FCM token was not associating correctly with an APNs
  device token, depending on when the APNs device token was made available.
- Fixed an issue where FCM tokens for different Sender IDs were not associating
  correctly with an APNs device token.
- Fixed an issue that was preventing the FCM direct channel from being
  established on the first start after 24 hours of being opened.
- Clarified a log message about method swizzling being enabled.

# 2017-09-13 -- v2.0.3
- Moved to safer use of NSAsserts, instead of lower-level `__builtin_trap()`
  method.
- Added logging of the underlying error code for an error trying to create or
  open an internal database file.

# 2017-08-25 -- v2.0.2
- Removed old logic which was saving the SDK version to NSUserDefaults.

# 2017-08-07 -- v2.0.1
- Fixed an issue where setting `shouldEstablishDirectChannel` in a background
  thread was triggering the Main Thread Sanitizer in Xcode 9.
- Removed some old logic related to logging.
- Added some additional logging around errors while method swizzling.

# 2017-05-03 -- v2.0.0
- Introduced an improved interface for Swift 3 developers
- Added new properties and methods to simplify FCM token management
- Added property, APNSToken, to simplify APNs token management
- Added new delegate method to be notified of FCM token refreshes
- Added new property, shouldEstablishDirectChannel, to simplify connecting
  directly to FCM

# 2017-03-31 -- v1.2.3

- Fixed an issue where custom UNNotificationCenterDelegates may not have been
  swizzled (if swizzling was enabled)
- Fixed a issue iOS 8.0 and 8.1 devices using scheduled notifications
- Improvements to console logging

# 2017-01-31 -- v1.2.2

- Improved topic subscription logic for more reliable subscriptions.
- Reduced memory footprint and CPU usage when subscribing to multiple topics.
- Better documentation in the public headers.
- Switched from ProtocolBuffers2 to protobuf compiler.

# 2016-10-12 -- v1.2.1

- Better documentation on the public headers.

# 2016-09-02 -- v1.2.0

- Support the UserNotifications framework introduced in iOS 10.
- Add a new API, -applicationReceivedRemoteMessage:, to FIRMessaging. This
  allows apps to receive data messages from FCM on devices running iOS 10 and
  above.

# 2016-07-06 -- v1.1.1

- Move FIRMessaging related plists to ApplicationSupport directory.

# 2016-05-04 -- v1.1.0

- Change flag to disable swizzling to *FirebaseAppDelegateProxyEnabled*.
- '[FIRMessaging appDidReceiveMessage:] returns FIRMessagingMessageInfo object.
- Minor bug fixes.

# 2016-01-25 -- v1.0.2

- Accept topic names without /topics prefix.
- Add Swift annotations to public static accessors.

# 2016-01-25 -- v1.0.0

- New Firebase messaging API.