Merge pull request #1604 from dexidp/fix-linters

.golangci.yml

cmd/dex/config_test.go

cmd/dex/serve.go

cmd/example-app/main.go

connector/bitbucketcloud/bitbucketcloud.go

connector/bitbucketcloud/bitbucketcloud_test.go

connector/github/github.go

connector/github/github_test.go

connector/gitlab/gitlab_test.go

connector/google/google.go

connector/keystone/keystone.go

connector/keystone/keystone_test.go

connector/ldap/ldap.go

connector/oidc/oidc_test.go

connector/saml/saml.go

server/api.go

server/api_test.go

server/handlers.go

server/handlers_test.go

server/server.go