message: Support printing BigIntLiteral nodes.
diff: @@ -768,6 +768,9 @@ function genericPrintNoParens(path, options, print) {
  case "RegExpLiteral": // Babel 6 Literal split
  return fromString(n.extra.raw);
  + case "BigIntLiteral": // Babel 7 Literal split
  + return fromString(n.value + "n");
  +
  case "BooleanLiteral": // Babel 6 Literal split
  case "NumericLiteral": // Babel 6 Literal split
  case "StringLiteral": // Babel 6 Literal split
  