build(deps): update rand_xorshift requirement from 0.1 to 0.2

[dependabot-preview]

Updates the requirements on rand_xorshift to permit the latest version.

Changelog

Sourced from rand_xorshift's changelog.

[0.2.0] - 2015-03-06

Fixed

• Compatible with Rust master (move from old_io to std::io)

[0.1.4] - 2015-03-04

Fixed

• Compatible with Rust master (use wrapping ops)

[0.1.3] - 2015-02-20

Fixed

• Compatible with Rust master

Removed

• Removed Copy implementations from RNGs

[0.1.2] - 2015-02-03

Added

• Imported functionality from std::rand, including:
  • StdRng, SeedableRng, TreadRng, weak_rng()
  • ReaderRng: A wrapper around any Reader to treat it as an RNG.
• Imported documentation from std::rand
• Imported tests from std::rand

[0.1.1] - 2015-02-03

Added

• Migrate to a cargo-compatible directory structure.

Fixed

• Do not use entropy during gen_weighted_bool(1)

[Rust 0.12.0] - 2014-10-09

Added

• Impl Rand for tuples of arity 11 and 12
• Include ChaCha pseudorandom generator
• Add next_f64 and next_f32 to Rng
• Implement Clone for PRNGs

Changed

• Rename TaskRng to ThreadRng and task_rng to thread_rng (since a
  runtime is removed from Rust).

Fixed

• Improved performance of ISAAC and ISAAC64 by 30% and 12 % respectively, by
  informing the optimiser that indexing is never out-of-bounds.

... (truncated)

Commits

• 5610bda Merge pull request #823 from dhardy/master
• 7690c21 Bump version to 0.7.0-pre.1
• 69912ea Require serde1 to enable serde support (reverts recent change)
• 1991d0c Fix Travis no_std test and remove old Cargo patch
• 8dd020c Prepare rand_pcg 0.2.0 release
• 18d5584 rand_pcg: add Pcg64 RNG
• fa26eb7 Use Edition 2018 in rand_pcg
• 1f1896f Prepare rand_hc 0.2.0 and update to edition 2018
• 4e5c08d Prepare rand_isaac 0.2.0 and update to edition 2018
• 17986eb Prepare rand_xorshift 0.2.0 and update to edition 2018
• Additional commits viewable in compare view

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