updated README file

Author: matkuznik

README.md

@@ -18,13 +18,19 @@ CocoaPods 1.0
 
 ## Installation
 
-SMFloatingLabelTextField is available through [CocoaPods](http://cocoapods.org). To install
+SMFloatingLabelTextField is available through [CocoaPods](http://cocoapods.org) and [Carthage](https://github.com/Carthage/Carthage). To install
 it, simply add the following line to your Podfile:
 
 ```ruby
 pod "SMFloatingLabelTextField"
 ```
 
+or Cartfile:
+
+```ruby
+github "AzimoLabs/SMFloatingLabelTextField"
+```
+
 ## Author
 
 Michał Moskała, micmos@azimo.com