Update module mssola/user_agent to v0.5.2

go.mod

go.sum

vendor/github.com/mssola/user_agent/.travis.yml

vendor/github.com/mssola/user_agent/CHANGELOG.md

vendor/github.com/mssola/user_agent/CONTRIBUTING.md

vendor/github.com/mssola/user_agent/LICENSE

vendor/github.com/mssola/user_agent/Makefile

vendor/github.com/mssola/user_agent/README.md

vendor/github.com/mssola/user_agent/bot.go

vendor/github.com/mssola/user_agent/browser.go

vendor/github.com/mssola/user_agent/go.mod

vendor/github.com/mssola/user_agent/operating_systems.go

vendor/github.com/mssola/user_agent/user_agent.go

vendor/modules.txt