message: add default trace renderer
diff: import * as A from "../Array"
  import type { FiberID } from "../Fiber/id"
  import type { Trace } from "../Fiber/tracing"
  +import { prettyTrace } from "../Fiber/tracing"
  import { pipe } from "../Function"
  import * as O from "../Option"
  import * as S from "../Sync"
  @@ -294,5 +295,5 @@ export function prettyM<E1>(cause: Cause<E1>, renderer: Renderer) {
  /**
  * Returns a `String` with the cause pretty-printed.
  */
  -export const pretty = <E1>(cause: Cause<E1>, renderer: Renderer) =>
  +export const pretty = <E1>(cause: Cause<E1>, renderer: Renderer = prettyTrace) =>
  S.run(prettyM(cause, renderer))
  