Add --changes to read changelog with full timestamps

As of 57f94a5, it's now possible
to have proper changelogs with dates and times properly set.
Thus, it makes sense to offer an option to render this information.

rpmpopt.in

@@ -107,6 +107,9 @@ Description :\n%{DESCRIPTION}\n' \
 rpm	alias --changelog --qf '[* %{CHANGELOGTIME:day} %{CHANGELOGNAME}\n%{CHANGELOGTEXT}\n\n]' \
 	--POPTdesc=$"list change logs for this package"
 
+rpm	alias --changes --qf '[* %{CHANGELOGTIME:date} %{CHANGELOGNAME}\n%{CHANGELOGTEXT}\n\n]' \
+	--POPTdesc=$"list changes for this package with full time stamps"
+
 rpm	alias --xml --qf '[%{*:xml}\n]' \
 	--POPTdesc=$"list metadata in xml"