📚 Document SearchResult#to_sequence_set is sorted

This is, unfortunately, different from ESearchResult#to_sequence_set's
behavior, since ESearchResult simply returns the SequenceSet as provided
by the server.

I would like to update this in a future release (perhaps 0.7).

Author: nevans

lib/net/imap/search_result.rb

@@ -123,6 +123,10 @@ def to_s(type = "SEARCH")
       #     Net::IMAP::SearchResult[9, 1, 2, 4, 10, 12, 3, modseq: 123_456]
       #       .to_sequence_set
       #     # => Net::IMAP::SequenceSet["1:4,9:10,12"]
+      #
+      # >>>
+      #   *NOTE:* +SORT+ order is not preserved.  The result will be sorted.
+      #
       def to_sequence_set; empty? ? SequenceSet.empty : SequenceSet[to_a] end
 
       def pretty_print(pp)