Update module github.com/gorilla/websocket to v1.5.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/gorilla/websocket	replace	minor	v1.4.2 -> v1.5.0

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Release Notes

gorilla/websocket (github.com/gorilla/websocket)

v1.5.0: Minor new features and maintenance update

Compare Source

Minor new features and maintenance update

CHANGELOG

• Dialer: add optional method NetDialTLSContext (#​746) @​lluiscampos
• Update README (#​757) @​garyburd
• Remove support for Go 1.8 (#​755) @​garyburd
• Improve protocol error messages (#​754) @​garyburd
• Update autobahn example (#​753) @​garyburd
• Fix broadcast benchmarks (#​542) @​FZambia
• Use context.Context in TLS handshake (#​751) @​garyburd
• Modify http Method String Literal to Variable (#​728) @​thak1411
• Update to match gofmt 1.17 (#​750) @​garyburd
• Document the allowed concurrency on Upgrader and Dialer (#​636) @​ghost
• improve echo example (#​671) @​hellflame
• build: use build matrix; drop Go <= 1.10 (#​629) @​elithrar
• Fix Docs w.r.t. setting subprotocols (#​627) @​elithrar
• Fix how the client checks for presence of Upgrade: websocket, Connection: upgrade (#​604) @​bluetech

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