Update ac-1.txt
simple clarification update

added (ac-3.txt) after this file
Added template ac-4

latex template and pdf version para atividade complementar 4
Update ac-3.txt

Adicionar : Histórico de Alterações
Merge branch 'master' of https://github.com/chesteve/teaching-ea976
Merge branch 'patch-1' of https://github.com/ra136249/teaching-ea976 into patch-1

Conflicts:
	ac-3.txt