Update README.md

Fix whitespace alignment

Author: stanhu

README.md

@@ -83,7 +83,7 @@ end
 | send_state                   | Should the authorize phase send a `state` parameter - this is recommended, not required by the OIDC specification                                                        | no       | true                          | false                                               |
 | response_mode                | The response mode per [spec](https://openid.net/specs/oauth-v2-form-post-response-mode-1_0.html)                                                                         | no       | nil                           | one of: :query, :fragment, :form_post, :web_message |
 | display                      | An optional parameter to the authorization request to determine how the authorization and consent page                                                                   | no       | nil                           | one of: :page, :popup, :touch, :wap                 |
-| prompt                       | An optional parameter to the authorization request to determine what pages the user will be shown                                                                         | no       | nil                           | one of: :none, :login, :consent, :select_account    |
+| prompt                       | An optional parameter to the authorization request to determine what pages the user will be shown                                                                        | no       | nil                           | one of: :none, :login, :consent, :select_account    |
 | send_scope_to_token_endpoint | Should the scope parameter be sent to the authorization token endpoint?                                                                                                  | no       | true                          | one of: true, false                                 |
 | post_logout_redirect_uri     | The logout redirect uri to use per the [session management draft](https://openid.net/specs/openid-connect-session-1_0.html)                                              | no       | empty                         | https://myapp.com/logout/callback                   |
 | uid_field                    | The field of the user info response to be used as a unique id                                                                                                            | no       | 'sub'                         | "sub", "preferred_username"                         |