fix: issue with exports not working correctly in common js scenarios

lib/axios.js

@@ -14,7 +14,6 @@ import toFormData from './helpers/toFormData.js';
 import AxiosError from './core/AxiosError.js';
 import spread from './helpers/spread.js';
 import isAxiosError from './helpers/isAxiosError.js';
-import AxiosHeaders from './core/AxiosHeaders.js';
 
 
 /**
@@ -75,10 +74,4 @@ axios.formToJSON = thing => {
   return formDataToJSON(utils.isHTMLForm(thing) ? new FormData(thing) : thing);
 };
 
-export {
-  axios as default,
-  Axios,
-  AxiosHeaders,
-  AxiosError,
-  CanceledError,
-};
+export default axios