Added Robotlegs 1.1 requirement to readme

Author: joelhooks

readme.markdown

@@ -1,3 +1,5 @@
 The SignalCommandMap is an extension for the Robotlegs-AS3 micro-architecture that makes use of AS3-Signals to trigger commands.
 
+[Requires Robotlegs 1.1](https://github.com/robotlegs/robotlegs-framework)
+
 [Here is an example and more details](http://joelhooks.com/2010/02/14/robotlegs-as3-signals-and-the-signalcommandmap-example/)