Update USAGE.md

vsmenon · vsmenon · commit e4f4ee01755c · 2016-04-16T11:24:02.000-07:00
diff --git a/USAGE.md b/USAGE.md
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 # Usage
 
+**This document is out-of-date.  We'll be updating it shortly.**
+
 The [Dart Dev Compiler](README.md) (DDC) is an **experimental**
 development tool and transpiler.  In particular, the ES6 backend is
 still incomplete, under heavy development, and not yet ready for
