Update README.md.

Author: Jeff Verkoeyen

README.md

@@ -9,25 +9,22 @@ An API diff tool for Objective-C, Swift, and Android code that outputs markdown.
 
 Engine for apple APIs requires:
 
-- Xcode 8 beta 6
+- Xcode 8
 - [sourcekitten](https://github.com/jpsim/SourceKitten)
 
 ## Usage
 
 Run `apidiff` from within a git repository like so:
 
-    apidiff v1.0.0 develop apple src/MaterialMotionRuntime.h
-    apidiff 1.0.0 develop android library
-
-## License
-
-Licensed under the Apache 2.0 license. See LICENSE for details.
+    apidiff <old git ref> <new git ref> objc <umbrella header>
+    apidiff <old git ref> <new git ref> swift <workspace path> <scheme name>
+    apidiff <old git ref> <new git ref> android <library>
 
 # Example output
 
 Auto-generated by running:
 
-    apidiff 734d43e406f53143c2cf8440f43d858d125f0a11 6f7a52744751e511d0daf119642446c46bed1f5c apple src/MaterialMotionRuntime.h
+    apidiff 734d43e406f53143c2cf8440f43d858d125f0a11 6f7a52744751e511d0daf119642446c46bed1f5c objc src/MaterialMotionRuntime.h
 
 ## NewClass
 
@@ -65,3 +62,7 @@ Auto-generated by running:
 |---|---|
 | From | `class MDMScheduler : NSObject` |
 | To | `class Scheduler : NSObject` |
+
+## License
+
+Licensed under the Apache 2.0 license. See LICENSE for details.