v3.0.1: add files: [] to package.json

package.json

@@ -1,8 +1,9 @@
 {
   "name": "le-challenge-dns",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "A manual (interactive CLI) dns-based strategy for Greenlock / Let's Encrypt / ACME DNS-01 challenges",
   "main": "index.js",
+  "files": [],
   "scripts": {
     "test": "node test.js"
   },