Update spec version in README

Signed-off-by: Evan Lezar <elezar@nvidia.com>

Author: elezar

SPEC.md

@@ -8,7 +8,7 @@
 
 ## Version
 
-This is CDI **spec** version **0.7.0**.
+This is CDI **spec** version **0.8.0**.
 
 ### Update policy