[Snyk] Security upgrade http-proxy from 1.11.3 to 1.18.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-HTTPPROXY-569139	No	Proof of Concept

Commit messages

Package name: http-proxy

The new version differs by 160 commits.

• 9b96cd7 1.18.1
• 335aeeb Skip sending the proxyReq event when the expect header is present (#1447)
• dba3966 Remove node6 support, add node12 to build (#1397)
• 9bbe486 [dist] Version bump. 1.18.0
• 6e4bef4 Added in auto-changelog module set to keepachangelog format (#1373)
• d056241 fix 'Modify Response' readme section to avoid unnecessary array copying (#1300)
• 244303b Fix incorrect target name for reverse proxy example (#1135)
• b4028ba Fix modify response middleware example (#1139)
• 77a9815 [dist] Update dependency async to v3 (#1359)
• c662f9e Fix path to local http-proxy in examples. (#1072)
• 806e492 fix reverse-proxy example require path (#1067)
• c8fa599 Update README.md (#970)
• 0d9ed36 [dist] Update dependency request to ~2.88.0 [SECURITY] (#1357)
• 9d75b98 [dist] Update dependency eventemitter3 to v4 (#1365)
• 192b2b9 [dist] Update dependency colors to v1 (#1360)
• 4a657a7 [dist] Update all non-major dependencies (#1356)
• 7a154f8 [dist] Update dependency agentkeepalive to v4 (#1358)
• 749eec6 [dist] Update dependency nyc to v14 (#1367)
• e588213 [dist] Update dependency concat-stream to v2 (#1363)
• 59c4403 [fix] Latest versions.
• dd1d08b [fix test] Update tests.
• 16d4f8a [dist] Regenerate package-lock.json.
• fc93520 [dist] .gitattributes all the things.
• 7e4a0e5 [dist] New test fixtures.

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