Update module gorilla/handlers to v1.5.1

This MR contains the following updates:

Package	Type	Update	Change
github.com/gorilla/handlers	require	minor	v1.4.2 -> v1.5.1

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Release Notes

gorilla/handlers

v1.5.1

Compare Source

v1.5.1 fixes an issue with the CompressHandler introduced in v1.5.0 that would break compression of some responses. We strongly recommend you upgrade to v1.5.1.

CHANGELOG

• Fix compression of *os.Files. (#​197) @​muirdm

v1.5.0

Compare Source

v1.5.1 fixes an issue with the CompressHandler introduced in v1.5.0 that would break compression of some responses. We strongly recommend you upgrade to v1.5.1.

This release improves how handlers manages existing http.ResponseWriters that are already wrapped with a Pusher or other extensions. It will no longer break existing implementations thanks to the changes made in #​193.

CHANGELOG

• Use httpsnoop to wrap ResponseWriter. (#​193) @​muirdm
• skip compression on upgrade connection (#​187) @​benitogf
• Use got-want style so mutation test can be performed easily with corr… (#​184) @​uudashr
• [compress] Vary: Accept-Encoding must always be set (#​175) @​dunglas
• Cleanup CompressHandlerLevel (#​173) @​fharding1

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