Update CHANGELOG.md

Author: esamcgv

CHANGELOG.md

@@ -1,9 +1,9 @@
 ### Version 4.6.0 (xxth April 2016)
 ### Added
-- Added `setEventSuccessDelegate` method on `AdjustConfig` object for setting callback to be triggered once event is successfully tracked.
-- Added `setEventFailureDelegate` method on `AdjustConfig` object for setting callback to be triggered once event tracking failed.
-- Added `setSessionSuccessDelegate` method on `AdjustConfig` object for setting callback to be triggered once session is successfully tracked.
-- Added `setSessionSuccessDelegate` method on `AdjustConfig` object for setting callback to be triggered once session tracking failed.
+- Added `setEventSuccessDelegate` method on `AdjustConfig` object for setting a callback to be triggered if event is successfully tracked.
+- Added `setEventFailureDelegate` method on `AdjustConfig` object for setting a callback to be triggered if event tracking failed.
+- Added `setSessionSuccessDelegate` method on `AdjustConfig` object for setting a callback to be triggered if session is successfully tracked.
+- Added `setSessionSuccessDelegate` method on `AdjustConfig` object for setting a callback to be triggered if session tracking failed.
 
 #### Changed
 - Changed `SimpleJSON` namespace from `SimpleJSON` to `com.adjust.sdk` to avoid conflicts if `SimpleJSON` is already being used in Unity3d project.