Clear repo

To be able to perform the migration, we need to start from an empty directory/repo.

vendor/sigs.k8s.io/yaml/.travis.yml

@@ -1,13 +0,0 @@
-language: go
-dist: xenial
-go:
-  - 1.12.x
-  - 1.13.x
-script:
-  - diff -u <(echo -n) <(gofmt -d *.go)
-  - diff -u <(echo -n) <(golint $(go list -e ./...) | grep -v YAMLToJSON)
-  - GO111MODULE=on go vet .
-  - GO111MODULE=on go test -v -race ./...
-  - git diff --exit-code
-install:
-  - GO111MODULE=off go get golang.org/x/lint/golint