Merge pull request #2207 from simov/move-aws4

Move aws4 require statement to the top

request.js

@@ -9,6 +9,7 @@ var http = require('http')
   , bl = require('bl')
   , hawk = require('hawk')
   , aws2 = require('aws-sign2')
+  , aws4 = require('aws4')
   , httpSignature = require('http-signature')
   , mime = require('mime-types')
   , stringstream = require('stringstream')
@@ -1264,10 +1265,9 @@ Request.prototype.aws = function (opts, now) {
     self._aws = opts
     return self
   }
-  
+
   if (opts.sign_version == 4 || opts.sign_version == '4') {
-    var aws4 = require('aws4')
-    // use aws4  
+    // use aws4
     var options = {
       host: self.uri.host,
       path: self.uri.path,