Update module go.opencensus.io to v0.22.6

See merge request !20

Update module cenkalti/backoff to v4

See merge request !18

Update module russross/blackfriday/v2 to v2.1.0

See merge request !16

Update module openzipkin/zipkin-go to v0.2.5

See merge request !14

Update module theckman/go-flock to v0.8.0

See merge request !17

Update module google/go-cmp to v0.5.4

See merge request !12

Update module prometheus/client_golang to v1.9.0

See merge request !15

Update module gorilla/handlers to v1.5.1

See merge request !13

Update module contrib.go.opencensus.io/exporter/zipkin to v0.1.2

See merge request !10

Update module go.opencensus.io to v0.22.5

See merge request !11

This reverts commit f8bba073.

That version is incompatible with go 1.11 (debian).

Update golang.org/x/crypto commit hash to eec23a3

See merge request !6

Update golang.org/x/sync commit hash to 09787c9

See merge request !7

Update github.com/emersion/go-textwrapper commit hash to 65d8968

See merge request !4

Update github.com/lunixbochs/struc commit hash to 784aaeb

See merge request !5

Configure Renovate

See merge request !3