title: how to retrieve old versions of keys using spring-cloud-vault?
body: <p>I'm using <code>spring-cloud-vault</code> to retrieve the versioned <code>kv</code> from the vault server. When I'm using the <code>environemnt.getSecret("key1")</code> then it returns only the latest versions of key for example <code>world2</code>. Is there any way to retrieve the old versions of secrets by specifying the version number for a given key using <code>spring-cloud-vault</code> library?</p>
  
  <pre><code>#vault kv put secret/my-app key1=world1
  Key              Value
  ---              -----
  created_time     2018-09-20T12:00:19.6136263Z
  deletion_time    n/a
  destroyed        false
  version          1
  
  #vault kv put secret/my-app key1=world2
  Key              Value
  ---              -----
  created_time     2018-09-20T12:00:27.1820524Z
  deletion_time    n/a
  destroyed        false
  version          2
  </code></pre>
  
  <p>Thanks for your help.</p>