Update lru requirement from 0.4.3 to 0.5.2

[dependabot-preview[bot]]

Updates the requirements on lru to permit the latest version.

Changelog

Sourced from lru's changelog.

v0.5.2 - 2020-06-17

• Fix nightly feature.

v0.5.1 - 2020-06-02

• Fix memory leak whereby old entries wouldn't be dropped when cache is full.

v0.5.0 - 2020-05-28

• Stop gating the alloc crate behind the nightly flag.

v0.4.5 - 2020-05-25

• Use as_mut_ptr in drop to fix memory leak.

v0.4.4 - 2020-05-19

• Use mem::MaybeUninit for key and value fields of nodes and not the nodes themselves.

v0.4.3 - 2019-12-10

• Add back import of alloc crate on nightly which was accidentally removed.

v0.4.2 - 2019-12-08

• Make hasbrown usage optional and add MSRV documentation.

v0.4.1 - 2019-11-26

• Use mem::MaybeUninit instead of mem::uninitialized.

v0.4.0 - 2019-10-28

• Use Borrow trait in contains and pop methods.

v0.3.1 - 2019-10-08

• Implement Debug for LruCache.

v0.3.0 - 2019-10-06

• Update the signature of the peek methods to use the Borrow trait and add a peek_mut method.

v0.2.0 - 2019-09-27

• Release a new minor version because of an accidental breaking change in the previous release (#50).

v0.1.18 - 2019-09-25

... (truncated)

Commits

• d0c2cbc Prepare release of v0.5.2
• b11d796 Merge pull request #86 from jeromefroe/jeromefroe/fix-nightly-feature
• d332872 Fix nightly feature
• 6d83b40 Merge pull request #84 from jeromefroe/jeromefroe/release-0.5.1
• 62b1949 Release version 0.5.1
• a003e93 Merge pull request #83 from jeromefroe/jeromefroe/fix-full-cache-memory-leak
• 76b774d Fix typo in comment
• d4f8dc4 Ensure old key and val are dropped when put on full
• aa8abfd Release v0.5.0
• 8490902 Merge pull request #81 from sunriseos/master
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #51.