doc(changelog): Spinnaker Version 1.13.0
doc(changelog): Spinnaker Version 1.13.0

spinnaker/spinnaker.github.io,spinnaker/spinnaker.github.io,ttomsu/spinnaker.github.io,ttomsu/spinnaker.github.io,ttomsu/spinnaker.github.io,spinnaker/spinnaker.github.io