Fix broken URLs in previous release titles.

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Change log
 
-## [1.4.0](https://github.com/ably/ably-asset-tracking-android/tree/1.4.0)
+## [1.4.0](https://github.com/ably/ably-asset-tracking-android/tree/v1.4.0)
 
 [Full Changelog](https://github.com/ably/ably-asset-tracking-android/compare/v1.4.0-rc.2...v1.4.0)
 
@@ -17,15 +17,15 @@
 
 - Refactor the event queue in the CoreSubscriber [\#660](https://github.com/ably/ably-asset-tracking-android/issues/660)
 
-## [1.4.0-rc.2](https://github.com/ably/ably-asset-tracking-android/tree/1.4.0-rc.2)
+## [1.4.0-rc.2](https://github.com/ably/ably-asset-tracking-android/tree/v1.4.0-rc.2)
 
 [Full Changelog](https://github.com/ably/ably-asset-tracking-android/compare/v1.4.0-rc.1...v1.4.0-rc.2)
 
 **Implemented enhancements:**
 
 - Make the client ID an optional parameter if users use a token-based auth [\#766](https://github.com/ably/ably-asset-tracking-android/issues/766)
 
-## [1.4.0-rc.1](https://github.com/ably/ably-asset-tracking-android/tree/1.4.0-rc.1)
+## [1.4.0-rc.1](https://github.com/ably/ably-asset-tracking-android/tree/v1.4.0-rc.1)
 
 Version 1.4.0 of the Ably Asset Tracking SDKs for Android uses the Mapbox Navigation SDK in version 2.8.0
 which enables users to use it together with the newest Mapbox Map SDK in version 10.8.0.
@@ -40,7 +40,7 @@ which enables users to use it together with the newest Mapbox Map SDK in version
 
 - Mapbox navigation dependency version updated to 2.8.0-rc.2 [\#761](https://github.com/ably/ably-asset-tracking-android/pull/761) ([davyskiba](https://github.com/davyskiba))
 
-## [1.3.0](https://github.com/ably/ably-asset-tracking-android/tree/1.3.0)
+## [1.3.0](https://github.com/ably/ably-asset-tracking-android/tree/v1.3.0)
 
 [Full Changelog](https://github.com/ably/ably-asset-tracking-android/compare/v1.2.0...1.3.0)