update 5.4.17 date

Author: smalyshev

NEWS

@@ -68,7 +68,7 @@ PHP                                                                        NEWS
   . Fixed bug #60560 (SplFixedArray un-/serialize, getSize(), count() return 0,
     keys are strings). (Adam)
 
-?? ??? 2013, PHP 5.4.17
+20 Jun 2013, PHP 5.4.17
 
 - Core:
   . Fixed bug #64988 (Class loading order affects E_STRICT warning). (Laruence)