adding comma separation for MailJet & Sendgrid | fixing immowelt | upgrading dependencies (#34)

lib/notification/adapter/sendGrid.js

@@ -14,7 +14,10 @@ exports.send = ({ serviceName, newListings, notificationConfig, jobKey }) => {
   sgMail.setApiKey(apiKey);
   const msg = {
     templateId,
-    to: receiver,
+    to: receiver
+      .trim()
+      .split(',')
+      .map((r) => r.trim()),
     from,
     subject: `Job ${jobKey} | Service ${serviceName} found ${newListings.length} new listing(s)`,
     dynamic_template_data: {