delete qrcode dependent lib

Author: syzh

library/qrcode/core/alphanumeric-data.js

@@ -1,7 +1,7 @@
-var BufferUtil = require('../utils/buffer')
+// var BufferUtil = require('../utils/buffer')
 
-var EXP_TABLE = BufferUtil.alloc(512)
-var LOG_TABLE = BufferUtil.alloc(256)
+var EXP_TABLE = Buffer.alloc(512)
+var LOG_TABLE = Buffer.alloc(256)
 /**
  * Precompute the log and anti-log tables for faster computation later
  *

library/qrcode/core/bit-buffer.js

@@ -1,4 +1,5 @@
-var VersionCheck = require('./version-check')
+var Utils = require('./utils')
+// var VersionCheck = require('./version-check')
 var Regex = require('./regex')
 
 /**
@@ -76,7 +77,7 @@ exports.MIXED = {
 exports.getCharCountIndicator = function getCharCountIndicator (mode, version) {
  if (!mode.ccBits) throw new Error('Invalid mode: ' + mode)
 
- if (!VersionCheck.isValid(version)) {
+ if (!Utils.VersionIsValid(version)) {
  throw new Error('Invalid version: ' + version)
  }