Append article to `trend_terms()` defaults

[rjake]

Use different defaults

trend_terms <- function(more = "an increase",
                        less = "a decrease",
                        same = "no difference") {

  ...

}

instead of

headliner/R/trend-terms.R

Lines 11 to 13 in c6f29e9

	trend_terms <- function(more = "increase",
	less = "decrease",
	same = "difference") {