Bump follow-redirects from 1.15.3 to 1.15.6 (#752)

Bumps
[follow-redirects](https://github.com/follow-redirects/follow-redirects)
from 1.15.3 to 1.15.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/35a517c5861d79dc8bff7db8626013d20b711b06"><code>35a517c</code></a>
Release version 1.15.6 of the npm package.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/c4f847f85176991f95ab9c88af63b1294de8649b"><code>c4f847f</code></a>
Drop Proxy-Authorization across hosts.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/8526b4a1b2ab3a2e4044299377df623a661caa76"><code>8526b4a</code></a>
Use GitHub for disclosure.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/b1677ce00110ee50dc5da576751d39b281fc4944"><code>b1677ce</code></a>
Release version 1.15.5 of the npm package.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/d8914f7982403ea096b39bd594a00ee9d3b7e224"><code>d8914f7</code></a>
Preserve fragment in responseUrl.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/65858205e59f1e23c9bf173348a7a7cbb8ac47f5"><code>6585820</code></a>
Release version 1.15.4 of the npm package.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/7a6567e16dfa9ad18a70bfe91784c28653fbf19d"><code>7a6567e</code></a>
Disallow bracketed hostnames.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/05629af696588b90d64e738bc2e809a97a5f92fc"><code>05629af</code></a>
Prefer native URL instead of deprecated url.parse.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/1cba8e85fa73f563a439fe460cf028688e4358df"><code>1cba8e8</code></a>
Prefer native URL instead of legacy url.resolve.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/72bc2a4229bc18dc9fbd57c60579713e6264cb92"><code>72bc2a4</code></a>
Simplify _processResponse error handling.</li>
<li>Additional commits viewable in <a
href="https://github.com/follow-redirects/follow-redirects/compare/v1.15.3...v1.15.6">compare
view</a></li>
</ul>
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