Merge pull request #638 from OpenEnergyDashboard/dependabot/npm_and_yarn/nodemailer-6.4.16

Bump nodemailer from 4.0.1 to 6.4.16

Author: huss

package-lock.json

@@ -71,7 +71,7 @@
     "moment-timezone": "~0.5.31",
     "morgan": "~1.9.0",
     "multer": "~1.3.1",
-    "nodemailer": "~4.0.1",
+    "nodemailer": "~6.4.16",
     "nodemailer-mailgun-transport": "~1.4.0",
     "package-lock": "~1.0.3",
     "pg-promise": "~10.6.1",