Update README.md

SAP-archive · Sep 25, 2019 · adb7db1 · adb7db1
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diff --git a/exercises-node/exercise04/README.md b/exercises-node/exercise04/README.md
@@ -88,7 +88,7 @@ For all exercises please make sure to use **Google Chrome**. If you haven't comp
 
 2. Add the following content:
 
- ```
+ ```swift
  using sap.capire.bookstore.CatalogService as CatalogService from '../srv/services';
 
  ////////////////////////////////////////////////////////////////////////////