Merge pull request opencontainers#414 from coolljt0725/layerout_version

Add ImageLayoutVersion const

Author: jonboulle

specs-go/v1/layout.go

@@ -16,6 +16,9 @@ package v1
 
 import "regexp"
 
+// ImageLayoutVersion is the version of ImageLayout
+const ImageLayoutVersion = "1.0.0"
+
 // ImageLayout is the structure in the "oci-layout" file, found in the root
 // of an OCI Image-layout directory.
 type ImageLayout struct {