Update README.md

Co-authored-by: Antonin Stefanutti <[email protected]>

Author: jiripetrlik

README.md

@@ -40,7 +40,7 @@ The e2e tests can be executed locally by running the following commands:
 2. Start the operator locally:
 
     ```bash
-    export NAMESPACE=default
+    NAMESPACE=default make run
     make run
     ```