Update dependency serve-favicon to ~2.4.3

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This PR contains the following updates:

Package	Type	Update	Change
serve-favicon	dependencies	minor	~2.3.0 -> ~2.4.3

By merging this PR, the issue #11 will be automatically resolved and closed:

Severity	CVSS Score	CVE
Low	3.4	WS-2017-0247

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Release Notes

expressjs/serve-favicon

v2.4.3

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• Use safe-buffer for improved Buffer API
• deps: ms@2.0.0

v2.4.2

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• deps: ms@1.0.0

v2.4.1

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• Remove usage of res._headers private field
• deps: fresh@0.5.0
  • Fix incorrect result when If-None-Match has both * and ETags
  • Fix weak ETag matching to match spec
  • perf: skip checking modified time if ETag check failed
  • perf: skip parsing If-None-Match when no ETag header
  • perf: use Date.parse instead of new Date

v2.4.0

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• deps: etag@~1.8.0
  • Use SHA1 instead of MD5 for ETag hashing
  • Works with FIPS 140-2 OpenSSL configuration
• deps: fresh@0.4.0
  • Fix false detection of no-cache request directive
  • perf: enable strict mode
  • perf: hoist regular expressions
  • perf: remove duplicate conditional
  • perf: remove unnecessary boolean coercions
• perf: simplify initial argument checking

v2.3.2

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• deps: ms@0.7.2

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