Bump src/code.cloudfoundry.org/gorouter
Bump src/code.cloudfoundry.org/gorouter

Bump thomasbuengener/gorouter
  Clay Kauzlaric:
     feature: trim signature header from route services
     refactor: always instantiate http_rewrite handler
     fix: build
     feat: allow to always trim certain headers
     feat: backfill redirect test
  Bruce Ricard:
     feature: backfill tests
[finishes #170269332]

Signed-off-by: Bruce Ricard <a654a0958b68f4302a4a9e85009637d7fed36fa2@pivotal.io>
Co-authored-by: Bruce Ricard <a654a0958b68f4302a4a9e85009637d7fed36fa2@pivotal.io>

cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release