Add dependencies to query.

Change-Id: Iba0416003901624d739cf8e1d3b5c2b109b508a6

Documentation/cmd-query.txt

@@ -15,6 +15,7 @@ SYNOPSIS
   [--files]
   [--comments]
   [--commit-message]
+  [--dependencies]
   [--]
   <query>
   [limit:<n>]
@@ -75,6 +76,10 @@ OPTIONS
 --commit-message::
 	Include the full commit message in the change description.
 
+--dependencies::
+	Show information about patch sets which depend on, or are needed by,
+	each patch set.
+
 limit:<n>::
 	Maximum number of results to return.  This is actually a
 	query operator, and not a command line option.	If more