message: Update the hcvault Go module to depend on the latest Tink version.
diff: @@ -3,7 +3,6 @@ module github.com/google/tink/go/integration/hcvault
  go 1.12
  require (
  - // TODO(oleksiys): Fix the core tink module dependency to v1.3.0 once it's released.
  - github.com/google/tink v1.3.0-rc1.0.20190919192935-b4142f9ab6af
  + github.com/google/tink/go v1.4.0-rc1
  github.com/hashicorp/vault/api v1.0.4
  )
  