Update change log

(Logical change 1.56)
diff --git a/ChangeLog b/ChangeLog
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+2004-07-07  Stephen Hemminger  <shemminger@osdl.org>
+
+	* Fix if_ether.h to fix arpd build
+	* Add hfsc scheduler support
+	* Add ip xfrm support
+	* Add add jitter (instead of rate) to netem scheduler
+
 2004-07-02  Stephen Hemminger  <shemminger@osdl.org>
 
 	* use compile to test for ATM libraries