Missing config documentation added

Author: Webklex

README.md

@@ -101,6 +101,9 @@ Detailed [config/imap.php](src/config/imap.php) configuration:
    - `fetch` — `FT_UID` (message marked as read by fetching the message) or `FT_PEEK` (fetch the message without setting the "read" flag)
    - `fetch_body` — If set to `false` all messages will be fetched without the body and any potential attachments
    - `fetch_attachment` —  If set to `false` all messages will be fetched without any attachments
+   - `fetch_flags` —  If set to `false` all messages will be fetched without any flags
+   - `message_key` — Message key identifier option
+   - `fetch_order` — Message fetch order
    - `open` — special configuration for imap_open()
      - `DISABLE_AUTHENTICATOR` — Disable authentication properties.
 

src/config/imap.php

@@ -80,6 +80,8 @@
     |       Default TRUE
     |   -Attachment download option
     |       Default TRUE
+    |   -Flag download option
+    |       Default TRUE
     |   -Message key identifier option
     |       You can choose between 'id', 'number' or 'list'
     |       'id'     - Use the MessageID as array key (default, might cause hickups with yahoo mail)