Bump pkg-config from 0.3.14 to 0.3.18

[dependabot-preview]

Bumps pkg-config from 0.3.14 to 0.3.18.

Changelog

Sourced from pkg-config's changelog.

[0.3.18] - 2020-07-11

Fixed

• Use env::var_os() almost everywhere to handle non-UTF8 paths in environment variables, and also improve error handling around environment variable handling (#106).

Changed

• Default the env_metadata build parameter to true instead of false. Whenever a pkg-config related environment variable changes it would make sense to rebuild crates that use pkg-config, or otherwise changes might not be picked up. As such the previous default didn't make much sense (#105).

[0.3.17] - 2019-11-02

Fixed

• Fix support for multiple version number constraints (#95)

[0.3.16] - 2019-09-09

Changed

• Stop using deprecated functions and require Rust 1.30 (#84)

Fixed

• Fix repository URL in README.md
• Fix various clippy warnings

Added

• Run cargo fmt as part of the CI (#89)
• Derive Clone for Library and Debug for `Config (#91)
• Add support for PKG_CONFIG_ALLOW_SYSTEM_CFLAGS and enable by default (#93)

[0.3.15] - 2019-07-25

Changed

• Changes minimum documented rust version to 1.28 (#76)

Fixed

• Fix Travis CI badge url (#78)
• Fix project name in README.md (#81)

Added

• Support specifying range of versions (#75)
• Allow cross-compilation if pkg-config is customized (#44, #86)

Commits

• e7b8cf5 Merge pull request #107 from rust-lang/release-0.3.18
• 4ebb446 Release 0.3.18
• d3dfa31 Merge pull request #105 from nagisa/nagisa/flip-default
• 71804a3 Default the env_metadata build parameter to true
• ad42450 Merge pull request #106 from nagisa/nagisa/var-os
• 01bc49f Improve error handling in targetted_env_var
• 37a51cd Use env::var_os (almost) everywhere
• ef356f3 Merge pull request #101 from AnderEnder/remove-deprecated-error-description-c...
• 0a171ed remove deprecated Error::description and cause
• 96e55cf Merge pull request #98 from sdroege/0.3.17-release
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #14.