Updated README

Author: ArtSabintsev

README.md

@@ -50,6 +50,12 @@ If a new version is available, an alert can be presented to the user informing t
 pod 'Siren'
 ```
 
+For Swift 2.3 support:
+
+```swift
+pod 'Siren', :git => 'https://github.com/ArtSabintsev/Siren.git', :branch => 'swift2.3'
+```
+
 For Swift 3 support:
 
 ```swift
@@ -61,6 +67,12 @@ pod 'Siren', :git => 'https://github.com/ArtSabintsev/Siren.git', :branch => 'sw
 github "ArtSabintsev/Siren"
 ```
 
+For Swift 2.3 support:
+
+``` swift
+github "ArtSabintsev/Siren" "swift2.3"
+```
+
 For Swift 3 support:
 
 ``` swift