missed a version in readme (#340)

Author: thomaszurkan-optimizely

README.md

@@ -36,7 +36,7 @@ Further installation instructions for Cocoapods: https://guides.cocoapods.org/us
 
 #### Carthage
 1. Add the following lines to the _Cartfile_:<pre> 
-github "optimizely/objective-c-sdk" "v2.1.1"
+github "optimizely/objective-c-sdk" "v2.1.4"
 </pre>
 
 2. Run the following command:<pre>```carthage update```</pre>