Update env_logger requirement from 0.6 to 0.7

[dependabot-preview[bot]]

Updates the requirements on env_logger to permit the latest version.

Release notes

Sourced from env_logger's 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

• @​95ulisse Indentation for multiline log messages
• @​oherrala Add more timestamp precisions
• Update to 2018 edition

Commits

• 424f031 Merge pull request #143 from KodrAus/cargo/0.7.0
• 058655e prepare for 0.7.0 release
• bfac641 Merge pull request #142 from KodrAus/feat/2018
• ef10fa5 use specific log version
• dc65e48 bump msrv to 1.31.0 for editions
• 8209524 update to 2018 edition
• 7105e63 make breaking changes to timestamp API
• 75911d7 Merge pull request #140 from oherrala/timestamp-formats
• 95cd4ed Trick the compiler to think we are using timestamp
• 92a5b2d Add more timestamp precisions
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.