remove unused require

src/mailer.js

@@ -27,7 +27,6 @@ var assert = require('assert'),
     async = require('async'),
     config = require('./config.js'),
     debug = require('debug')('box:mailer'),
-    digitalocean = require('./digitalocean.js'),
     dns = require('dns'),
     docker = require('./docker.js').connection,
     ejs = require('ejs'),
@@ -35,7 +34,6 @@ var assert = require('assert'),
     path = require('path'),
     safe = require('safetydance'),
     smtpTransport = require('nodemailer-smtp-transport'),
-    sysinfo = require('./sysinfo.js'),
     userdb = require('./userdb.js'),
     util = require('util'),
     _ = require('underscore');