[sfml] Fixed README.

spine-sfml/cpp/README.md

@@ -1,6 +1,6 @@
 # spine-sfml
 
-The spine-sfml runtime provides functionality to load, manipulate and render [Spine](http://esotericsoftware.com) skeletal animation data using [SFML](http://www.sfml-dev.org/). spine-sfml is based on [spine-c](../../spine-cpp).
+The spine-sfml runtime provides functionality to load, manipulate and render [Spine](http://esotericsoftware.com) skeletal animation data using [SFML](http://www.sfml-dev.org/). spine-sfml is based on [spine-cpp](../../spine-cpp).
 
 ## Licensing