During some minimization efforts on the previous released version 28.2-jre, I noticed a spurious file in the published version on maven central:

```
tn@proteus:~/Downloads$ unzip -l guava-28.2-jre.jar  | grep swp
    16384  2019-09-18 17:29   com/google/common/collect/.ImmutableListMultimap.java.swp
```

Looks like an transient artefact from an editor that slipped into the release. It is not present in the android variant or in older releases (I checked at least 28.1-jre).

Minor things that can not be changed anymore but maybe a trigger for improvement of future releases.

Edit: I noticed that 29.0 has been released that does not contain this spurious file.
* by its natural ordering, use {@code toSortedSet(Ordering.natural())}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code ImmutableSortedSet.copyOf(comparator,
   * stream.iterator())}, or pass {@link ImmutableSortedSet#toImmutableSortedSet} to {@code
   * stream.collect()}.
   *
   * @param comparator the function by which to sort set elements
   * @throws NullPointerException if any element of this iterable is {@code null}
   * @since 14.0 (since 12.0 as {@code toImmutableSortedSet()}).
   */
  public final ImmutableSortedSet<E> toSortedSet(Comparator<? super E> comparator) {
    return ImmutableSortedSet.copyOf(comparator, getDelegate());
  }
  /**
   * Returns an {@code ImmutableMultiset} containing all of the elements from this fluent iterable.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code ImmutableMultiset.copyOf(stream.iterator())}, or
   * pass {@link ImmutableMultiset#toImmutableMultiset} to {@code stream.collect()}.
   *
   * @throws NullPointerException if any element is null
   * @since 19.0
   */
  public final ImmutableMultiset<E> toMultiset() {
    return ImmutableMultiset.copyOf(getDelegate());
  }
  /**
   * Returns an immutable map whose keys are the distinct elements of this {@code FluentIterable}
   * and whose value for each key was computed by {@code valueFunction}. The map's iteration order
   * is the order of the first appearance of each key in this iterable.
   *