Who was the visiting team when the leading scorer was Jones : 20?
CREATE TABLE "april" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "leading_scorer" text,
  "attendance" text,
  "record" text,
  "streak" text
);
SELECT "visitor" FROM "april" WHERE "leading_scorer"='jones : 20';