chore(package): update nodemailer to version 6.4.8

Closes #116

Author: greenkeeper[bot]

package.json

@@ -126,7 +126,7 @@
     "less": "3.11.1",
     "less-plugin-autoprefix": "2.0.0",
     "loader-utils": "2.0.0",
-    "nodemailer": "6.4.6",
+    "nodemailer": "6.4.8",
     "npm-run-all": "4.1.5",
     "ora": "4.0.4",
     "prettier": "2.0.5",