code: public static <K, V> EntryStream<K, V> of(K k1, V v1, K k2, V v2) {
          return of(Stream.of(new SimpleImmutableEntry<>(k1, v1), new SimpleImmutableEntry<>(k2, v2)));
      }
docs: Returns a sequential {@code EntryStream} containing two key-value pairs
  
  @param <K> the type of key
  @param <V> the type of value
  @param k1 the key of the first element
  @param v1 the value of the first element
  @param k2 the key of the second element
  @param v2 the value of the second element
  @return a sequential stream
  @since 0.2.3