Update DEVELOPMENT.md to include new information about changes to .proto files (#5506)
Update DEVELOPMENT.md to include new information about changes to .proto files (#5506)

* update section 'Making changes to the Skaffold API'
GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold