Since we started using modules, it's a good time to update some deps.
Update to latest official versions packages that have newer versions.
Update #1247
Godep is long deprecated and modules is the future.
Updating dependencies with godep is painful and non-transparent.
This will hopefully help to create custom golangci-lint linters.
The change was created with:
go mod init
rm -rf vendor
go mod vendor
Fixes#1247
