🐛 Fix spelling of \Remote mailbox attr constant

Fixes #508.

Author: voxik

lib/net/imap/flags.rb

@@ -173,7 +173,7 @@ class IMAP < Protocol
     SUBSCRIBED = :Subscribed
 
     # The mailbox is a remote mailbox.
-    REMOTE = :Remove
+    REMOTE = :Remote
 
     # Alias for NO_INFERIORS, to match the \IMAP spelling.
     NOINFERIORS   = NO_INFERIORS