change log for P0503036 (close)

date	time	user	object	table	field	type	old	new
2021-06-01	10:35:23	Marcin Banaszek	E137 1. WCCT 1972-1975	refsrc	number	update		E137
2021-06-01	10:34:39	Marcin Banaszek	P0503036	problems	soltxt	update		Judge Osmo Kaila