Build command fix

Author: lutovich

README.md

@@ -232,7 +232,7 @@ Subscriber API allows following combinations of `onNext`, `onCompleted` and `onE
 ## Building
 
     npm install
-    npm build
+    npm run build
 
 This produces browser-compatible standalone files under `lib/browser` and a Node.js module version under `lib/`.
 See files under `examples/` on how to use.