Bump log from 0.4.2 to 0.4.3

[dependabot-preview[bot]]

Bumps log from 0.4.2 to 0.4.3.

Release notes

*Sourced from [log's releases](https://github.com/rust-lang/log/releases).* > ## env_logger-0.4.3 > - Make log target configurable ([#105](https://github-redirect.dependabot.com/rust-lang/log/issues/105), thanks [**dbrgn**](https://github.com/dbrgn))

Changelog

*Sourced from [log's changelog](https://github.com/rust-lang-nursery/log/blob/master/CHANGELOG.md).* > ## [0.4.3] - 2018-06-29 > > ### Improved > > * More code generation improvements.

Commits

- [`98abd8f`](https://github.com/rust-lang-nursery/log/commit/98abd8feeaba4a8c7bdbf429bf2fb9eaab3faf68) Bump log to 0.3.8 and env_logger to 0.4.3 - [`cf501f6`](https://github.com/rust-lang-nursery/log/commit/cf501f637578394612ea88f103e3b117cbf9f71e) Merge pull request [#160](https://github-redirect.dependabot.com/rust-lang/log/issues/160) from opilar/bugfix/documentation-link - [`c7c232b`](https://github.com/rust-lang-nursery/log/commit/c7c232b921c93609aca2cd23039ecb1ad3749c0d) Merge pull request [#159](https://github-redirect.dependabot.com/rust-lang/log/issues/159) from opilar/feature/badges - [`044e328`](https://github.com/rust-lang-nursery/log/commit/044e328698698c6d95c6a62b6680e56ee17d8e28) Merge pull request [#158](https://github-redirect.dependabot.com/rust-lang/log/issues/158) from omh1280/crate_linkify - [`85124a3`](https://github.com/rust-lang-nursery/log/commit/85124a326c9b3654a13014e62dcd85b237b17cb8) Merge pull request [#157](https://github-redirect.dependabot.com/rust-lang/log/issues/157) from omh1280/loglevel_doc - [`49c7889`](https://github.com/rust-lang-nursery/log/commit/49c78892ef85d37cd14d9260390a9f8b8ede20a3) Merge pull request [#155](https://github-redirect.dependabot.com/rust-lang/log/issues/155) from omh1280/macro_docs - [`29ffe46`](https://github.com/rust-lang-nursery/log/commit/29ffe46d7b0f97840af9a9f4189ae9ac57720dff) Docs link to docs.rs - [`bdae692`](https://github.com/rust-lang-nursery/log/commit/bdae692f3eaf9b40f165268376d35dacded0d1b9) Cargo.toml badges - [`7251e30`](https://github.com/rust-lang-nursery/log/commit/7251e3000b5eb63caf9bc50c591d32eaea0ae2f7) Linkified the crate doc - [`328fa85`](https://github.com/rust-lang-nursery/log/commit/328fa85b2b3f7bdb825f28b1529328c5339f6cba) LogLevel and LogLevelFilter doc improvements. - Additional commits viewable in [compare view](https://github.com/rust-lang/log/compare/env_logger-0.4.2...env_logger-0.4.3)

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Superseded by #45.