Bumps [superagent](https://github.com/visionmedia/superagent) from 3.6.0 to 3.8.3. **This update includes security fixes.**
<details>
<summary>Vulnerabilities fixed</summary>
*Sourced from The GitHub Security Advisory Database.*
> **Low severity vulnerability that affects superagent**
> The HTTP client module superagent is vulnerable to ZIP bomb attacks. In a ZIP bomb attack, the HTTP server replies with a compressed response that becomes several magnitudes larger once uncompressed. If a client does not take special care when processing such responses, it may result in excessive CPU and/or memory consumption. An attacker might exploit such a weakness for a DoS attack. To exploit this the attacker must control the location (URL) that superagent makes a request to.
>
> Affected versions: <3.7.0
*Sourced from [The Sonatype OSS Index](https://ossindex.sonatype.org/vuln/6b42d0b8-d68c-4f60-8815-a51f4a3efa29).*
> **CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)**
> The software does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.
>
> Affected versions: <3.7.0
</details>
<details>
<summary>Release notes</summary>
*Sourced from [superagent's releases](https://github.com/visionmedia/superagent/releases).*
> ## v3.8.3
>
> * Add flags for 201 & 422 responses (Nikhil Fadnis)
> * Emit progress event while uploading Node `Buffer` via send method (Sergey Akhalkov)
> * Fixed setting correct cookies for redirects (Damien Clark)
> * Replace .catch with ['catch'] for IE9 Support (Miguel Stevens)
>
> ## v3.8.2
>
> * Fixed handling of exceptions thrown from callbacks
> * Stricter matching of `+json` MIME types.
>
> ## v3.8.1
>
> * Clear authorization header on cross-domain redirect
>
> ## v3.8.0
>
> * Added support for "globally" defined headers and event handlers via `superagent.agent()`. It now remembers default settings for all its requests.
> * Added optional callback to `.retry()` (Alexander Murphy)
> * Unified auth args handling in node/browser (Edmundo Alvarez)
> * Fixed error handling in zlib pipes (Kornel)
> * Documented that 3xx status codes are errors (Mickey Reiss)
>
> ## v3.7.0
>
> * Limit maximum response size. Prevents zip bombs (Kornel)
> * Catch and pass along errors in `.ok()` callback (Jeremy Ruppel)
> * Fixed parsing of XHR headers without a newline (nsf)
>
> ## v3.6.2
>
> * Upgrade MIME type dependency to a newer, secure version
> * Recognize PDF MIME as binary
> * Fix for error in subsequent require() calls (Steven de Salas)
</details>
<details>
<summary>Changelog</summary>
*Sourced from [superagent's changelog](https://github.com/visionmedia/superagent/blob/master/History.md).*
> # 3.8.3 (2018-04-29)
>
> * Add flags for 201 & 422 responses (Nikhil Fadnis)
> * Emit progress event while uploading Node `Buffer` via send method (Sergey Akhalkov)
> * Fixed setting correct cookies for redirects (Damien Clark)
> * Replace .catch with ['catch'] for IE9 Support (Miguel Stevens)
>
> # 3.8.2 (2017-12-09)
>
> * Fixed handling of exceptions thrown from callbacks
> * Stricter matching of `+json` MIME types.
>
> # 3.8.1 (2017-11-08)
>
> * Clear authorization header on cross-domain redirect
>
> # 3.8.0
>
> * Added support for "globally" defined headers and event handlers via `superagent.agent()`. It now remembers default settings for all its requests.
> * Added optional callback to `.retry()` (Alexander Murphy)
> * Unified auth args handling in node/browser (Edmundo Alvarez)
> * Fixed error handling in zlib pipes (Kornel)
> * Documented that 3xx status codes are errors (Mickey Reiss)
>
> # 3.7.0 (2017-10-17)
>
> * Limit maximum response size. Prevents zip bombs (Kornel)
> * Catch and pass along errors in `.ok()` callback (Jeremy Ruppel)
> * Fixed parsing of XHR headers without a newline (nsf)
>
> # 3.6.2 (2017-10-02)
>
> * Upgrade MIME type dependency to a newer, secure version
> * Recognize PDF MIME as binary
> * Fix for error in subsequent require() calls (Steven de Salas)
</details>
<details>
<summary>Commits</summary>
- [`295dfcd`](295dfcdace) Bump
- [`c2f65c6`](c2f65c665c) Lock marked version due to bug
- [`75d1ca0`](75d1ca0751) Fix [#1366](https://github-redirect.dependabot.com/visionmedia/superagent/issues/1366) docs
- [`bf1a87a`](bf1a87ab75) Merge pull request [#1360](https://github-redirect.dependabot.com/visionmedia/superagent/issues/1360) from itsfadnis/flags_for_201_and_422
- [`386f702`](386f7021e8) Add flags for 201 & 422 responses
- [`d70933c`](d70933ce58) Make GitHub happy
- [`b176c0e`](b176c0e953) Be super clear piping in superagent breaks everything else
- [`336b51e`](336b51e8f8) Merge pull request [#1351](https://github-redirect.dependabot.com/visionmedia/superagent/issues/1351) from jedwards1211/patch-2
- [`038bd46`](038bd464d8) file => field
- [`a6fc595`](a6fc5959c7) typo fix
- Additional commits viewable in [compare view](https://github.com/visionmedia/superagent/compare/v3.6.0...v3.8.3)
</details>
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