Update git.autistici.org/ai3/go-common digest to 39e01d3

go.mod

go.sum

vendor/contrib.go.opencensus.io/exporter/zipkin/.travis.yml

vendor/contrib.go.opencensus.io/exporter/zipkin/Makefile

vendor/contrib.go.opencensus.io/exporter/zipkin/README.md

vendor/contrib.go.opencensus.io/exporter/zipkin/go.mod

vendor/contrib.go.opencensus.io/exporter/zipkin/go.sum

vendor/contrib.go.opencensus.io/exporter/zipkin/zipkin.go

vendor/git.autistici.org/ai3/go-common/.gitlab-ci.yml

...or/git.autistici.org/ai3/go-common/clientutil/balancer.go

vendor/git.autistici.org/ai3/go-common/go.mod

vendor/git.autistici.org/ai3/go-common/go.sum

vendor/git.autistici.org/ai3/go-common/serverutil/http.go

vendor/git.autistici.org/ai3/go-common/serverutil/json.go

...t.autistici.org/ai3/go-common/serverutil/proxy_headers.go

vendor/git.autistici.org/ai3/go-common/serverutil/tls.go

vendor/git.autistici.org/ai3/go-common/tracing/tracing.go

vendor/github.com/NYTimes/gziphandler/.gitignore

vendor/github.com/NYTimes/gziphandler/.travis.yml

vendor/github.com/NYTimes/gziphandler/CODE_OF_CONDUCT.md