Update env_logger requirement from 0.4 to 0.6

[dependabot-preview]

Updates the requirements on env_logger to permit the latest version.

Release notes

Sourced from env_logger's releases.

0.6.1

Key Changes

• Support better capturing for cargo test
• Don't print internal logs to stdout

Contributions

• @​nlopes Fix path for rust-lang favicon
• @​emilio Don't print to stdout the warnings due to an invalid spec
• Support capturing for cargo test

More Details

Builder::is_test

The is_test method can be used in tests to make sure logs are captured by cargo test the same way println! is:

fn init() {
    let _ = env_logger::builder().is_test(true).try_init();
}

#[test]
fn it_adds_one() {
    init();

    info!("can log from the test too");
    assert_eq!(3, add_one(2));
}

There are performance implications of using is_test though, so it should be avoided outside of unit tests.

Commits

• 2ae080e prepare for 0.6.1 release (#128)
• 8fa6240 Support capturing for cargo test (#127)
• 811db32 Merge pull request #126 from emilio/no-stdout
• 86e4ac9 filter: Don't print to stdout the warnings due to an invalid spec.
• acc1b2c Merge pull request #120 from nlopes/nlopes/fix-favicon
• cf8e325 Fix path for rust-lang favicon
• ebf4829 Merge pull request #112 from KodrAus/cargo/0.6.0
• fa6a7df Merge pull request #117 from KodrAus/fix/retain-previously-set-max-level
• 21858cd don't clobber a previously set level filter
• c1f2c20 Merge pull request #114 from hcpl/minimal-versions
• Additional commits viewable in compare view

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