Update morgan requirement from ~1.7.0 to ~1.9.1

[dependabot-preview]

Updates the requirements on morgan to permit the latest version.

Release notes

Sourced from morgan's releases.

1.9.1

• Fix using special characters in format
• deps: depd@~1.1.2
  • perf: remove argument reassignment

Changelog

Sourced from morgan's changelog.

1.9.1 / 2018-09-10

• Fix using special characters in format
• deps: depd@~1.1.2
  • perf: remove argument reassignment

1.9.0 / 2017-09-26

• Use res.headersSent when available
• deps: basic-auth@~2.0.0
  • Use safe-buffer for improved Buffer API
• deps: debug@2.6.9
• deps: depd@~1.1.1
  • Remove unnecessary Buffer loading

1.8.2 / 2017-05-23

• deps: debug@2.6.8
  • Fix DEBUG_MAX_ARRAY_LENGTH
  • deps: ms@2.0.0

1.8.1 / 2017-02-04

• deps: debug@2.6.1
  • Fix deprecation messages in WebStorm and other editors
  • Undeprecate DEBUG_FD set to 1 or 2

1.8.0 / 2017-02-04

• Fix sending unnecessary undefined argument to token functions
• deps: basic-auth@~1.1.0
• deps: debug@2.6.0
  • Allow colors in workers
  • Deprecated DEBUG_FD environment variable
  • Fix error when running under React Native
  • Use same color for same namespace
  • deps: ms@0.7.2
• perf: enable strict mode in compiled functions

1.7.0 / 2016-02-18

• Add digits argument to response-time token
• deps: depd@~1.1.0
  • Enable strict mode in more places

... (truncated)

Commits

• 572dd93 1.9.1
• e02de38 lint: apply standard 12 style
• e329663 Fix using special characters in format
• eb1968a tests: use strict equality checks
• 310b206 build: use yaml eslint configuration
• 5810937 build: Node.js@9.11
• f60afd5 build: Node.js@8.11
• 5295b0c build: eslint-plugin-standard@3.1.0
• 178daaf build: eslint-plugin-promise@3.8.0
• 7b08641 build: eslint-plugin-import@2.12.0
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #33.