fix(to-array-buffer.js): replace deprecated method

Author: pine

lib/to-array-buffer.js

@@ -2,7 +2,7 @@
 
 module.exports = function (base64Data) {
   var isBrowser = typeof window !== 'undefined' && typeof window.atob === 'function'
-  var binary = isBrowser ? window.atob(base64Data) : new Buffer(base64Data, 'base64').toString('binary')
+  var binary = isBrowser ? window.atob(base64Data) : Buffer.from(base64Data, 'base64').toString('binary')
   var bytes = new Uint8Array(binary.length)
 
   for (var i = 0; i < binary.length; ++i) {