Fixing issue with minified bundle in IE8

closes #87

lib/axios.js

@@ -5,7 +5,7 @@ var utils = require('./utils');
 var dispatchRequest = require('./core/dispatchRequest');
 var InterceptorManager = require('./core/InterceptorManager');
 
-var axios = module.exports = function axios(config) {
+var axios = module.exports = function (config) {
   config = utils.merge({
     method: 'get',
     headers: {},