fy should inherit 'character'

[todo]

grattan/R/cpi_inflator.R

Lines 187 to 192 in f1cea8b

	# TODO: fy should inherit 'character'
	cpi.indices.new[, fy_year := as.character(fy_year)]
	cpi.indices <-
	rbindlist(list(cpi.indices, cpi.indices.new),
	use.names = TRUE,

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This issue was generated by todo based on a TODO comment in f1cea8b when #201 was merged. cc @HughParsonage.