Update README.md

sky/README.md

@@ -2,13 +2,12 @@ Sky
 ===
 
 For information about using the latest stable release of Sky, please see the
-[Sky SDK](sdk/).
+[package/sky/ directory](packages/sky/).
 
 For more information about the Sky framework, see
-[the sdk/lib directory](sdk/lib/).
+[the package/sky/lib/ directory](packages/sky/lib/).
 
-For details about the internals of Sky's engine, see [the engine/
-directory](engine/).
+For details about the internals of Sky's engine, see [the engine/ directory](engine/).
 
 For information about contributing to Sky, please see
 [CONTRIBUTING.md](../CONTRIBUTING.md).