use readable-stream instead of stream

Author: taymoork2

lib/data-stream.js

@@ -1,6 +1,6 @@
 /*global module, process*/
 var Buffer = require('safe-buffer').Buffer;
-var Stream = require('stream');
+var Stream = require('readable-stream');
 var util = require('util');
 
 function DataStream(data) {

lib/sign-stream.js

@@ -2,7 +2,7 @@
 var Buffer = require('safe-buffer').Buffer;
 var DataStream = require('./data-stream');
 var jwa = require('jwa');
-var Stream = require('stream');
+var Stream = require('readable-stream');
 var toString = require('./tostring');
 var util = require('util');
 

lib/verify-stream.js

@@ -2,7 +2,7 @@
 var Buffer = require('safe-buffer').Buffer;
 var DataStream = require('./data-stream');
 var jwa = require('jwa');
-var Stream = require('stream');
+var Stream = require('readable-stream');
 var toString = require('./tostring');
 var util = require('util');
 var JWS_REGEX = /^[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?\.([a-zA-Z0-9\-_]+)?$/;