move version to package

version/version.go

@@ -0,0 +1,19 @@
+package version
+
+import "fmt"
+
+const (
+	// VersionMajor is for an API incompatible changes
+	VersionMajor = 0
+	// VersionMinor is for functionality in a backwards-compatible manner
+	VersionMinor = 4
+	// VersionPatch is for backwards-compatible bug fixes
+	VersionPatch = 1
+
+	// VersionDev indicates development branch. Releases will be empty string.
+	VersionDev = "dev"
+)
+
+// Version is the specification version that the package types support.
+var Version = fmt.Sprintf("%d.%d.%d+%s",
+	VersionMajor, VersionMinor, VersionPatch, VersionDev)