Adding second then on axios call (#1623)

Inspired by this issue : https://github.com/axios/axios/issues/792#issuecomment-289306590

README.md

@@ -56,10 +56,15 @@ Performing a `GET` request
 // Make a request for a user with a given ID
 axios.get('/user?ID=12345')
   .then(function (response) {
+    // handle success
     console.log(response);
   })
   .catch(function (error) {
+    // handle error
     console.log(error);
+  })
+  .then(function () {
+    // always executed
   });
 
 // Optionally the request above could also be done as
@@ -73,6 +78,9 @@ axios.get('/user', {
   })
   .catch(function (error) {
     console.log(error);
+  })
+  .then(function () {
+    // always executed
   });  
 
 // Want to use async/await? Add the `async` keyword to your outer function/method.