refactor retrieving ICS file

lib/services/crawler.js

@@ -0,0 +1,24 @@
+const request = require('request')
+
+const crawl = async (url) => {
+  return new Promise((resolve, reject) => {
+    console.info(`Started request for URL: ${url}`)
+    request({
+      url,
+      headers: {
+        'Accept-Language': 'en-US, en',
+        'User-Agent': 'request',
+      },
+    }, (err, res, body) => {
+      if (err) {
+        reject(err)
+        return
+      }
+
+      console.info(`Finished request for URL: ${url}`)
+      resolve(body)
+    })
+  })
+}
+
+module.exports = crawl