New refactor with &. operator

Last version of rubocop start offence to something like safe navigation operator.

	if start_date && start_date < start_of_month && end_date.nil?
	# …
	end
	if start_date &.< start_of_month && end_date.nil?
	# …
	end
	if (start_date &.< start_of_month) && end_date.nil?
	# …
	end

view raw and_operator.rb hosted with ❤ by GitHub

Now you can write it shorter.

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