Update rand_pcg requirement from 0.2 to 0.3

[dependabot-preview[bot]]

Updates the requirements on rand_pcg to permit the latest version.

Changelog

Sourced from rand_pcg's changelog.

[0.3.0] - 2015-03-25

Changed

• Update to use log version 0.3.x

[0.2.1] - 2015-03-22

Fixed

• Compatible with Rust master
• Fixed iOS compilation

[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

Commits

• 98e220c Merge pull request #1072 from dhardy/work
• 95fea0e Fix link in README; rename keyword as suggested in #1073
• 459d863 Prepare rand_chacha 0.3.0 release
• 15aebf4 Prepare rand_pcg 0.3.0
• 14c2016 Prepare rand_hc 0.3.0
• d95dbd2 Prepare rand_core 0.6.0
• 6682db1 Merge pull request #1073 from rust-random/work2
• 33b8f37 Address review: use assert_almost_eq macro
• 354468e Use approximate assertions in value stability and increase some tolerences sl...
• 33a78de Add cross test (inspired by ndarray CI)
• Additional commits viewable in compare view

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