npm install + git add -a

node_modules/axios/lib/helpers/AxiosURLSearchParams.js

@@ -0,0 +1,42 @@
+'use strict';
+
+var toFormData = require('./toFormData');
+
+function encode(str) {
+  var charMap = {
+    '!': '%21',
+    "'": '%27',
+    '(': '%28',
+    ')': '%29',
+    '~': '%7E',
+    '%20': '+',
+    '%00': '\x00'
+  };
+  return encodeURIComponent(str).replace(/[!'\(\)~]|%20|%00/g, function replacer(match) {
+    return charMap[match];
+  });
+}
+
+function AxiosURLSearchParams(params, options) {
+  this._pairs = [];
+
+  params && toFormData(params, this, options);
+}
+
+var prototype = AxiosURLSearchParams.prototype;
+
+prototype.append = function append(name, value) {
+  this._pairs.push([name, value]);
+};
+
+prototype.toString = function toString(encoder) {
+  var _encode = encoder ? function(value) {
+    return encoder.call(this, value, encode);
+  } : encode;
+
+  return this._pairs.map(function each(pair) {
+    return _encode(pair[0]) + '=' + _encode(pair[1]);
+  }, '').join('&');
+};
+
+module.exports = AxiosURLSearchParams;