v2.1.9: ignore failed background refresh

package-lock.json

@@ -0,0 +1,5 @@
+{
+  "name": "le-sni-auto",
+  "version": "2.1.9",
+  "lockfileVersion": 1
+}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "le-sni-auto",
-  "version": "2.1.8",
+  "version": "2.1.9",
   "description": "An auto-sni strategy for registering and renewing letsencrypt certificates using SNICallback",
   "homepage": "https://git.coolaj86.com/coolaj86/le-sni-auto.js",
   "main": "index.js",