Bump im from 14.2.0 to 15.1.0

[dependabot]

Bumps im from 14.2.0 to 15.1.0.

Changelog

Sourced from im's changelog.

[15.1.0] - 2022-04-29

Added

• HashSet now implements From<Vector<A>> and From<&Vector<A>> where A: Clone.

Fixed

• Fixed a long standing crash bug in OrdMap/OrdSet. (#154, #143, #152, #124)
• The union method on maps/sets will now prefer to mutate the larger set (which leads to less work) rather than the first set. (#163)
• Ensure TreeFocus only implements Send/Sync when the underlying type does. (#157, #158)
• There was an issue where nodes in very large OrdMaps could overflow when removing an element and cause a panic, which has now been fixed. (#141)
• Assorted doc cleanup. (#150, #173, #186, #194)

[15.0.0] - 2020-05-15

Changed

• Map iterators now return (&K, &V) and (&K, &mut V) respectively, to be consistent with std::collections's API. DiffIter for OrdMap has also changed in the same manner. (#121)

Removed

• The pool feature flag has been removed from the im version of the crate, as refpool no longer supports threadsafe pools.
• HashSet::iter_mut() has been removed, because if you modify the hashed values in a hash set, you break the hash set.

Added

• The pool feature flag was missing from the im-rc version of the crate, which is the version where it's actually useful. It's been added now.
• DiffIter now has a Debug implementation.
• There is now a Vector::is_inline() method to determine whether a Vector is currently inlined. (#129)

Fixed

• A smarter implementation of the sorting algorithm for Vector has improved the performance of Vector::sort by approximately 2x. (#126)

[14.3.0] - 2020-03-03

Changed

• proptest strategies have been moved to im::proptest. The previous locations of the strategies (im::vector::proptest etc) are still available, but have been deprecated.

... (truncated)

Commits

• 71331ea (cargo-release) version 15.1.0
• 9847c3f Sync im-rc Cargo.toml.
• 9b8ee6a Remove the now obsolete no-dev-version field from release.toml.
• 973ad84 Remove the obsolete Travis CI badge.
• cc065e0 Set rust-version to 1.46.0 in Cargo.toml.
• 744c626 Appease Clippy.
• 5c69ba9 Update changelog.
• 546e59b Bump some deps, fix some warnings.
• 0b3a7b2 Add Send and Sync bounds for TreeFocus
• 9c2726a Fix a typo in the docs ("`true" => "`true`")
• Additional commits viewable in compare view

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