dpkg: Add --status-logger information to --help output

Missed in commit 73dab65273c589b7eed823adab30870e77171bb8.

debian/changelog

@@ -62,6 +62,7 @@ dpkg (1.16.2) UNRELEASED; urgency=low
     the .changes file using ‘all’ as architecture. Closes: #661638
   * Handle unknown architectures gracefully in dpkg-buildflags.
     Closes: #663004
+  * Add missing --status-logger to dpkg --help output.
 
   [ Raphaël Hertzog ]
   * Update Dpkg::Shlibs to look into multiarch paths when cross-building

src/main.c

@@ -145,6 +145,7 @@ usage(const struct cmdinfo *ci, const char *value)
 "                             Just say what we would do - don't do it.\n"
 "  -D|--debug=<octal>         Enable debugging (see -Dhelp or --debug=help).\n"
 "  --status-fd <n>            Send status change updates to file descriptor <n>.\n"
+"  --status-logger=<command>  Send status change updates to <command>'s stdin.\n"
 "  --log=<filename>           Log status changes and actions to <filename>.\n"
 "  --ignore-depends=<package>,...\n"
 "                             Ignore dependencies involving <package>.\n"