Correct app name.

rabbah · rabbah · commit 36eaad36d616 · 2017-12-13T12:09:46.000-05:00
diff --git a/docs/README.md b/docs/README.md
@@ -519,7 +519,7 @@ The app will now produce the decoded text as its final output.
 
 ```bash
 # create app
-$ fsh app create try @demos/retain.js
+$ fsh app create retain @demos/retain.js
 
 # invoke app with valid parameter
 > fsh app invoke retain -p str aGVsbG8gdHJ5IQ==
