Method setExecutor

app/src/main/java/eu/faircode/email/SimpleTask.java:114–118

(ExecutorService executor)

    }

    @NonNull
    public SimpleTask<T> setExecutor(ExecutorService executor) {
        this.localExecutor = executor;
        return this;
    }

    public SimpleTask<T> serial() {
        return setExecutor(serialExecutor);