Post RSS feed items from yesterday to Slack

{
  "id": 89,
  "name": "Post RSS feed items from yesterday to Slack",
  "nodes": [
    {
      "name": "Build our message",
      "type": "n8n-nodes-base.function",
      "position": [
        1160,
        400
      ],
      "parameters": {
        "functionCode": "// Create our Slack message\n// This will output a list of RSS items in the following format\n// Title - Description\nlet message = \"*:new: Posts from yesterday :new:*\\n\\n\";\n\n// Loop the input items\nfor (item of items) {\n  message += \"*<\" + item.json.link + \"|\" + item.json.title + \">*\\n\" + item.json.contentSnippet + \"\\n\\n\"; \n}\n\n// Return our message\nreturn [{json: {message}}];"
      },
      "typeVersion": 1
    },
    {
      "name": "Every Morning",
      "type": "n8n-nodes-base.cron",
      "position": [
        380,
        420
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "hour": 8
            }
          ]
        }
      },
      "typ...