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
dep tool vendored too much code (100MB) including tests and unused packages.
godep vendored significantly less (12MB) without tests and unused packages.
The main advantage is that pre-Go1.9 toolchain does not run tests
of all vendor packages now.