Auto merge of #7422 - rust-lang:dependabot/cargo/env_logger-0.7.0, r=Eh2406
Auto merge of #7422 - rust-lang:dependabot/cargo/env_logger-0.7.0, r=Eh2406

Update env_logger requirement from 0.6.0 to 0.7.0

Updates the requirements on [env_logger](https://github.com/sebasmagri/env_logger) to permit the latest version.
<details>
<summary>Release notes</summary>

*Sourced from [env_logger's releases](https://github.com/sebasmagri/env_logger/releases).*

> ## 0.7.0
> # Key Changes
>
> - Indent multiline messages by default
> - Support more timestamp precision
> - Update to the 2018 edition
>
> # Changes to minimum Rust
>
> The minimum version of Rust required has been set at `1.31.0`. We may change this in patch versions, but will always flag it in the release notes here.
>
> You can always check the `.travis.yml` file to see the current minimum supported version.
>
> # Contributions
>
> - [@&#8203;95ulisse](https://github.com/95ulisse) [Indentation for multiline log messages](https://github-redirect.dependabot.com/sebasmagri/env_logger/pull/134)
> - [@&#8203;oherrala](https://github.com/oherrala) [Add more timestamp precisions](https://github-redirect.dependabot.com/sebasmagri/env_logger/pull/140)
> - [Update to 2018 edition](https://github-redirect.dependabot.com/sebasmagri/env_logger/pull/142)
</details>
<details>
<summary>Commits</summary>

- [`424f031`](https://github.com/sebasmagri/env_logger/commit/424f03167401b0cff8f3da8424adc3dc1e7683d0) Merge pull request [#143](https://github-redirect.dependabot.com/sebasmagri/env_logger/issues/143) from KodrAus/cargo/0.7.0
- [`058655e`](https://github.com/sebasmagri/env_logger/commit/058655eb6875414debae568c0346038eca83c1fe) prepare for 0.7.0 release
- [`bfac641`](https://github.com/sebasmagri/env_logger/commit/bfac6411adb05b7587b5de4acea0d5c3044ef029) Merge pull request [#142](https://github-redirect.dependabot.com/sebasmagri/env_logger/issues/142) from KodrAus/feat/2018
- [`ef10fa5`](https://github.com/sebasmagri/env_logger/commit/ef10fa512ab253ca86cbb9f8f95731b64aadf323) use specific log version
- [`dc65e48`](https://github.com/sebasmagri/env_logger/commit/dc65e48bae6e13c302451d58e2002f1354d5db01) bump msrv to 1.31.0 for editions
- [`8209524`](https://github.com/sebasmagri/env_logger/commit/8209524a2898b8367b369437e7de2dd48a14edb4) update to 2018 edition
- [`7105e63`](https://github.com/sebasmagri/env_logger/commit/7105e63885e2e325f3eceddcfe0ae6ae95e1ee0f) make breaking changes to timestamp API
- [`75911d7`](https://github.com/sebasmagri/env_logger/commit/75911d7711477b7efd8d0e6eb0886b2c54a17b6f) Merge pull request [#140](https://github-redirect.dependabot.com/sebasmagri/env_logger/issues/140) from oherrala/timestamp-formats
- [`95cd4ed`](https://github.com/sebasmagri/env_logger/commit/95cd4ed266be75d64bdf05c459c44bba5d759e30) Trick the compiler to think we are using timestamp
- [`92a5b2d`](https://github.com/sebasmagri/env_logger/commit/92a5b2dfa56d6926c97f07919aed857c39ac571e) Add more timestamp precisions
- Additional commits viewable in [compare view](https://github.com/sebasmagri/env_logger/compare/v0.6.0...v0.7.0)
</details>
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