Update README.md

Author: cp2boston

README.md

@@ -4,7 +4,7 @@
 See the wiki for more information.
 
 ## Installation ##
-`composer require "rosette/api: ~1.3"`
+`composer require "rosette/api: ~1.4"`
 
 ## Docker ##
 A Docker image for running the examples against the compiled source library is available on Docker Hub.