specs-go/state: Fix 'version' -> 'ociVersion'

This should have been ociVersion since 7117ede (Expand on the
definition of our ops, 2015-10-13, #225) changed the key in
runtime.md.

Signed-off-by: W. Trevor King <[email protected]>

Author: wking

specs-go/state.go

@@ -3,7 +3,7 @@ package specs
 // State holds information about the runtime state of the container.
 type State struct {
 	// Version is the version of the specification that is supported.
-	Version string `json:"version"`
+	Version string `json:"ociVersion"`
 	// ID is the container ID
 	ID string `json:"id"`
 	// Pid is the process id for the container's main process.