fix config path

src/cert/acme.js

@@ -4,12 +4,12 @@
 
 var assert = require('assert'),
     async = require('async'),
-    config = require('./config.js'),
+    config = require('../config.js'),
     crypto = require('crypto'),
     debug = require('debug')('acme'),
     fs = require('fs'),
     path = require('path'),
-    paths = require('./paths.js'),
+    paths = require('../paths.js'),
     safe = require('safetydance'),
     superagent = require('superagent'),
     ursa = require('ursa'),