Change Sim attribute dump field key hash->sha256

lvcnrpy/Sim.py

@@ -141,6 +141,6 @@ class Sim(File):
 
         # Add hash as id for simulation
         sha = hashlib.sha256(open(self.filename, 'rb').read()).hexdigest()
-        attrs.append(("hash", sha))
+        attrs.append(("sha256", sha))
 
         return OrderedDict(attrs)