message: Fix usage of old API in tutorial.
diff: @@ -94,10 +94,10 @@ $.RULE("selectClause", () => {
  let columns = []
  $.CONSUME(Select);
  - $.AT_LEAST_ONE_SEP(Comma, () => {
  + $.AT_LEAST_ONE_SEP({SEP:Comma, DEF:() => {
  // accessing a token's string via getImage utility
  columns.push(getImage($.CONSUME(Identifier))
  - })
  + }})
  return {
  type : "SELECT_CLAUSE",
  