v1.9.0

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• The new methods IndexedParallelIterator::by_exponential_blocks and
  by_uniform_blocks allow processing items in smaller groups at a time.
• The new iter::walk_tree, walk_tree_prefix, and walk_tree_postfix
  functions enable custom parallel iteration over tree-like structures.
• The new method ParallelIterator::collect_vec_list returns items as a linked
  list of vectors, which is an efficient mode of parallel collection used by
  many of the internal implementations of collect.
• The new methods ParallelSliceMut::par_split_inclusive_mut,
  ParallelSlice::par_split_inclusive, and
  ParallelString::par_split_inclusive all work like a normal split but
  keeping the separator as part of the left slice.
• The new ParallelString::par_split_ascii_whitespace splits only on ASCII
  whitespace, which is faster than including Unicode multi-byte whitespace.
• OsString now implements FromParallelIterator<_> and ParallelExtend<_>
  for a few item types similar to the standard FromIterator and Extend.
• The internal Pattern trait for string methods is now implemented for
  [char; N] and &[char; N], matching any of the given characters.