fix(Effects): Remove toPayload utility function

[brandonroberts]

BREAKING CHANGE: toPayload function is no longer exported

BEFORE:
import { toPayload } from '@ngrx/effects';

actions$.ofType('SOME_ACTION').map(toPayload);

AFTER:

actions$.ofType('SOME_ACTION').map((action: SomeActionWithPayload) => action.payload)

[karptonite]

Does this mean that there won't be another release until the next major release? Is a major release imminent? I was hoping for a patch release that included the fix in #570, as mentioned here. #570 (comment)

[MikeRyanDev]

@karptonite Major release is imminent. Other than bumping the minimum version of RxJS and removing toPayload it should be a very straightforward upgrade.