add homepage url

package.json

@@ -1,6 +1,7 @@
 {
   "name": "greenlock-koa",
-  "version": "2.1.2",
+  "homepage": "https://git.coolaj86.com/coolaj86/greenlock-koa.js",
+  "version": "2.1.3",
   "description": "An Automated HTTPS ACME client (Let's Encrypt v2) for Koa",
   "main": "index.js",
   "scripts": {