Updated documentation.

Author: Edward Smith

ChangeLog.md

@@ -4,6 +4,7 @@ Branch iOS SDK Change Log
   * Branch can now optionally track Apple Search Ad campaign attribution.
   * Sharing channels have been updated to be human readable and match the Android names.
   * Cleaned up some warnings in the system log.
+  * Updated TestBed for running devices that run iOS 7.
 
 - v0.12.15
   * Fixed a potential crash bug: Added a nil checks when moving the preferences file.