Bump version to 1.1.15 beta.1

Ably.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name              = "Ably"
-  s.version           = "1.1.15-beta.0"
+  s.version           = "1.1.15-beta.1"
   s.summary           = "iOS, tvOS and macOS Objective-C and Swift client for Ably"
   s.description       = <<-DESC
                         iOS, tvOS and macOS Objective-C and Swift client library for ably.io, the realtime messaging service.

README.md

@@ -130,7 +130,7 @@ If you see, for example, a `dyld: Library not loaded: @rpath/SocketRocketAblyFor
 
 ### Manual installation 
 
-1. Get the code from GitHub [from the release page](https://github.com/ably/ably-ios/releases/tag/1.1.15-beta.0), or clone it to get the latest, unstable and possibly underdocumented version: `git clone [email protected]:ably/ably-ios.git`
+1. Get the code from GitHub [from the release page](https://github.com/ably/ably-ios/releases/tag/1.1.15-beta.1), or clone it to get the latest, unstable and possibly underdocumented version: `git clone [email protected]:ably/ably-ios.git`
 2. Drag the directory `ably-ios/ably-ios` into your project as a group.
 3. Ably depends on our [SocketRocket Fork](https://github.com/ably-forks/SocketRocket) 0.5.2; get it [from the releases page](https://github.com/ably-forks/SocketRocket/releases/tag/0.5.2-ably-2) and follow [its manual installation instructions](https://github.com/ably-forks/SocketRocket/#installing).
 4. Ably also depends on our [MessagePack Fork](https://github.com/ably-forks/msgpack-objective-C) 0.2.0; get it [from the releases page](https://github.com/ably-forks/msgpack-objective-C/releases/tag/0.2.0-ably-1) and link it into your project.