Update README.md

scenarios/import_iterable_to_treasuredata/README.md

@@ -7,20 +7,20 @@ This scenario shows how you can ingest data not supported by the Iterable connec
 1. Update the destination database and table values in the `import_iterable_to_td.dig` file (`<database_name>` and `<table_name>`).
 
 2. Upload the workflow with TD CLI.
-
+```
     $ td wf push import_iterable_to_td
-
+```
 3. Set the Iterable API Key and Treasure Data API Key as workflow secrets using the `td wf secrets` command.
-
+```
     # Set Iterable API Key workflow secret
     $ td wf secrets --project import_iterable_to_td --set iterable.apikey=<iterable_api_key>
 
     # Set Treasure Data API Key workflow secret
     $ td wf secrets --project import_iterable_to_td --set td.apikey=<treasuredata_master_api_key>
-
+```
 Finally, you can trigger the session manually.
-
+```
     # Run
     $ td wf start import_iterable_to_td import_iterable_to_td --session now
-
+```
 If you have any questions, contact to support@treasuredata.com.