Bump helmet from 3.16.0 to 3.18.0 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] May 6, 2019 Merged May 7, 2019

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Bumps helmet from 3.16.0 to 3.18.0.

Changelog

Sourced from helmet's changelog.

3.18.0 - 2019-05-05

Added

• featurePolicy has 19 new features: ambientLightSensor, documentDomain, documentWrite, encryptedMedia, fontDisplayLateSwap, layoutAnimations, legacyImageFormats, loadingFrameDefaultEager, oversizedImages, pictureInPicture, serial, syncScript, unoptimizedImages, unoptimizedLosslessImages, unoptimizedLossyImages, unsizedMedia, verticalScroll, wakeLock, and xr

Changed

• Updated expect-ct to v0.2.0
• Updated feature-policy to v0.3.0
• Updated frameguard to v3.1.0
• Updated nocache to v2.1.0

3.17.0 - 2019-05-03

Added

• referrerPolicy now supports multiple values

Changed

• Updated referrerPolicy to v1.2.0

Commits

• 238d3a4 3.18.0
• 65a5d23 Update expect-ct, feature-policy, frameguard, and nocache
• 6ac5e84 Minor: remove line breaks from CHANGELOG markdown
• 87f8d15 3.17.0
• d13893c Update devDependencies to latest versions
• ea6c415 Update referrer-policy to 1.2.0
• f7a531a Whitelist published files with files
• 123e93c 3.16.0
• e9c6eab Update changelog for 3.16.0 release
• 1cff218 Update ienoopen to v1.1.0
• Additional commits viewable in compare view

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