Bump im from 10.2.0 to 12.3.2

[dependabot-preview]

Bumps im from 10.2.0 to 12.3.2.

Release notes

Sourced from im's releases.

12.3.1

Changed

• Unsafe chunks have been separated out into the sized-chunks crate, which is now a dependency of im.

Changelog

Sourced from im's changelog.

[12.3.2] - 2019-03-05

Changed

• Clone constraints on all data structures, as well as relevant constraints on
  maps and sets, have been relaxed where possible, so that you can now construct
  empty instances and call most query methods without requiring values implement
  Clone etc. (#63)

Fixed

• Constructing an empty Vector will not allocate any heap memory, instead
  deferring allocation until you perform an operation that would increase its
  length. (#65)
• Some bugs arising when using Vector::append repeatedly were fixed. (#67,
  #70)

[12.3.1] - 2019-02-19

Changed

• Unsafe chunks have been separated out into the sized-chunks crate, which is
  now a dependency of im.

[12.3.0] - 2019-01-15

Added

• singleton methods have been deprecated and renamed to unit.
• Vector::chunks and Vector::chunks_mut have been deprecated and renamed to
  leaves and leaves_mut to avoid confusion with Vec::chunks. (#50)

Fixed

• Fixed an issue where the HashMap draining iterator might access uninitialised memory leading to
  undefined behaviour. (#60)
• Fixed multiple issues in Vector::split_off and Vector::append that would cause lookup errors
  and unexpectedly unbalanced trees. (#55).

[12.2.0] - 2018-10-12

Added

• OrdMap and OrdSet now have a range() method which makes an iterator over
  a bounded subset of the values. The improved iterator implementation is also
  considerably more efficient than the previous (about an order of magnitude
  faster for nontrivial data sets). iter() has been updated to take advantage
  of this, and is now just an alias for range(..). (#27)
• FocusMut now has an unmut method to turn it into an immutable Focus,
  releasing its exclusive hold on the underlying Vector.
• Focus now implements Clone.

... (truncated)

Commits

• fef443b (cargo-release) version 12.3.2
• c0dfafe Fix warning in makefile.
• 6e37a68 Properly expose the contents of nodes::btree::DiffItem for sets.
• b3eee57 Changelog for recent merge bug fixes.
• a8198c7 Skip calling push_size as well as push_child_node for fully drained nodes.
• 83bb4e7 Fix a silly nerge conflict error.
• e7d67af Merge pull request #71 from krobelus/issue_70
• 7f7a6f3 Merge branch 'master' into issue_70
• 7c365ab Handle empty size table in Node::len()
• eeaefeb Avoid adding empty chunks
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #25.