Auto merge of #7847 - rust-lang:dependabot/cargo/pretty_env_logger-0.4, r=alexcrichton
Auto merge of #7847 - rust-lang:dependabot/cargo/pretty_env_logger-0.4, r=alexcrichton

Update pretty_env_logger requirement from 0.3 to 0.4

Updates the requirements on [pretty_env_logger](https://github.com/seanmonstar/pretty-env-logger) to permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/fa4e28537f153a20e655349556ec982e3657a848"><code>fa4e285</code></a> v0.4.0</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/693b5e70880ada9fcca6c10766f5c55f656980e8"><code>693b5e7</code></a> Remove chrono dependency</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/28c5ad0cbbc206b661f1e35784fc2a2d2d11a9ed"><code>28c5ad0</code></a> env_logger: 0.6.2 -&gt; 0.7.0</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/0288e4ed4b730239c401b46b78b818fa3875171b"><code>0288e4e</code></a> fixes env goof in README.md</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/76d9fc760608eff42bbf7deb77ad2cab2cd1172e"><code>76d9fc7</code></a> Make env_logger dependency public</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/8ddffae2c556108640af9d4faf95d51f773f2623"><code>8ddffae</code></a> v0.3.1</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/04c1aa50e1f07fa2be33ea6866c05e39a073f015"><code>04c1aa5</code></a> require latest env_logger</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/ce8c2f12fb72f634f8467f2e5e4fc4a19edafa7c"><code>ce8c2f1</code></a> fix deprecated calls</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/67d2e7d68b3449229c4876bb0813bed50d65b207"><code>67d2e7d</code></a> timestamps with milliseconds</li>
<li><a href="https://github.com/seanmonstar/pretty-env-logger/commit/27eaa2bc1bb666b0888027c106d00cc0ab50d2bc"><code>27eaa2b</code></a> fix with_builder_1 example (<a href="https://github-redirect.dependabot.com/seanmonstar/pretty-env-logger/issues/25">#25</a>)</li>
<li>See full diff in <a href="https://github.com/seanmonstar/pretty-env-logger/compare/v0.3.0...v0.4.0">compare view</a></li>
</ul>
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