update go-containerregistry

.travis.yml

@@ -5,8 +5,5 @@ go:
   - 1.10.x
 go_import_path: github.com/GoogleContainerTools/kaniko
 
-before_script:
-  - export DOCKER_API_VERSION=1.37
-
 script:
   - make test

Gopkg.lock

@@ -417,7 +417,7 @@
   revision = "e89373fe6b4a7413d7acd6da1725b83ef713e6e4"
 
 [[projects]]
-  digest = "1:f7bc7ff5f70d0dc7a31c12430a1f7bd66bd9afe6b3f0ff571d6ddbfbb692e417"
+  digest = "1:b347f4d441e737532862875ab98e47a2b631cd9d1348103e92bee722d69bf287"
   name = "github.com/google/go-containerregistry"
   packages = [
     "pkg/authn",
@@ -436,7 +436,7 @@
     "pkg/v1/v1util",
   ]
   pruneopts = "NUT"
-  revision = "697ee0b3d46eff19ed2b30f86230377061203f79"
+  revision = "5f7b0e4895413d785ff15b84d218d73e8a47866a"
 
 [[projects]]
   branch = "master"

Gopkg.toml

@@ -49,7 +49,7 @@ required = [
 
 [[constraint]]
   name = "github.com/google/go-containerregistry"
-  revision = "697ee0b3d46eff19ed2b30f86230377061203f79"
+  revision = "5f7b0e4895413d785ff15b84d218d73e8a47866a"
 
 [[override]]
   name = "github.com/tonistiigi/fsutil"

vendor/github.com/google/go-containerregistry/pkg/v1/daemon/image.go

@@ -79,7 +79,6 @@ var getImageSaver = func() (ImageSaver, error) {
 	}
 	cli.NegotiateAPIVersion(context.Background())
 	return cli, nil
-	// return client.NewEnvClient()
 }
 
 func saveImage(ref name.Reference) (io.ReadCloser, error) {

vendor/github.com/google/go-containerregistry/pkg/v1/daemon/write.go

@@ -36,7 +36,12 @@ type ImageLoader interface {
 
 // This is a variable so we can override in tests.
 var GetImageLoader = func() (ImageLoader, error) {
-	return client.NewEnvClient()
+	cli, err := client.NewEnvClient()
+	if err != nil {
+		return nil, err
+	}
+	cli.NegotiateAPIVersion(context.Background())
+	return cli, nil
 }
 
 // WriteOptions are used to expose optional information to guide or