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

Cargo.toml

@@ -27,7 +27,7 @@ crossbeam-utils = "0.6"
 crypto-hash = "0.3.1"
 curl = { version = "0.4.21", features = ['http2'] }
 curl-sys = "0.4.18"
-env_logger = "0.6.0"
+env_logger = "0.7.0"
 pretty_env_logger = { version = "0.3", optional = true }
 failure = "0.1.5"
 filetime = "0.2"