update dist readme

[ci skip]

Author: nfriedly

dist/README.md

@@ -1,10 +1,13 @@
-Note: the latest *stable* release can always be found on [GitHub Releases] 
-or, for [browserify] users, on [npm]:
+These files are automatically updated by the `npm version x` command, primarily for [Bower].
+
+You can also retrieve the latest version fom [GitHub Releases] or [npm]:
 
 ```sh
 npm install --save watson-speech
 ```
 
+The files here are .gitignore'd to avoid accidentally committing development changes.
+
+[Bower]: https://bower.io/
 [GitHub Releases]: https://github.com/watson-developer-cloud/speech-javascript-sdk/releases
 [npm]: https://www.npmjs.com/package/watson-speech
-[browserify]: http://browserify.org/