Update task-public-api.js to include note about required Babel transf…

…orm for arrow functions (#569)

packages/ember-concurrency/src/-private/task-public-api.js

@@ -63,7 +63,7 @@ import { TaskGroup } from './task-group';
  */
 export function task(taskFnOrProtoOrDecoratorOptions, key, descriptor) {
   assert(
-    `It appears you're attempting to use the new task(async () => { ... }) syntax, but the async arrow task function you've provided is not being properly compiled by Babel.\n\nPossible causes / remedies:\n\n1. You must pass the async function expression directly to the task() function (it is not currently supported to pass in a variable containing the async arrow fn, or any other kind of indirection)\n2. The new task syntax is only supported by native classes. Ensure that this is one.\n3. If this code is in an addon, please ensure the addon specifies ember-concurrency "2.3.0" or higher in "dependencies" (not "devDependencies")\n4. Ensure that there is only one version of ember-concurrency v2.3.0+ being used in your project (including nested dependencies) and consider using npm/yarn/pnpm resolutions to enforce a single version is used`,
+    `It appears you're attempting to use the new task(async () => { ... }) syntax, but the async arrow task function you've provided is not being properly compiled by Babel.\n\nPossible causes / remedies:\n\n1. You must pass the async function expression directly to the task() function (it is not currently supported to pass in a variable containing the async arrow fn, or any other kind of indirection)\n2. The new task syntax is only supported by native classes. Ensure that this is one.\n3. If this code is in an addon, please ensure the addon specifies ember-concurrency "2.3.0" or higher in "dependencies" (not "devDependencies")\n4. Ensure that there is only one version of ember-concurrency v2.3.0+ being used in your project (including nested dependencies) and consider using npm/yarn/pnpm resolutions to enforce a single version is used\n5. Ensure that you have registered the Babel transform that Ember Concurrency uses to transform tasks in the "async-arrow" notation, see https://ember-concurrency.com/docs/v4-upgrade`,
     !isUntranspiledAsyncFn(arguments[arguments.length - 1]),
   );