`takeFirst` and `takeLast` are not index safe

[philippschweig]

takeFirst and takeLast are not index safe.

Excerpt of takeFirst: sublist is not index safe

extension IterableTakeFirst<E> on Iterable<E> {
  List<E> takeFirst(int n) {
    final list = this is List<E> ? this as List<E> : toList();
    return list.sublist(0, n);
  }
}

[passsy]

Already fixed #156