Bump github.com/gorilla/websocket from 1.4.2 to 1.5.0 in /agent

[dependabot[bot]]

Bumps github.com/gorilla/websocket from 1.4.2 to 1.5.0.

Release notes

Sourced from github.com/gorilla/websocket's releases.

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

Commits

• 9111bb8 Dialer: add optional method NetDialTLSContext (#746)
• 2f25f78 Update README (#757)
• 4fad403 Remove support for Go 1.8
• f0643a3 Improve protocol error messages
• 2d6ee4c Update autobahn example
• beca1d3 Fix broadcast benchmarks (#542)
• bcef843 Use context.Context in TLS handshake (#751)
• 2c89656 Modify http Method String Literal to Variable (#728)
• 1905f7e Update source to match output from gofmt 1.17
• b4b5d88 Document the allowed concurrency on Upgrader and Dialer (#636)
• Additional commits viewable in compare view

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