Added require line in readme

STRd6 · STRd6 · commit 04c1ee236587 · 2014-05-07T18:16:38.000-07:00
diff --git a/README.md b/README.md
@@ -11,6 +11,8 @@ Node
 Usage
 -----
 
+    Observable = require "o_0"
+
 Get notified when the value changes.
 
     observable = Observable 5
