Merge pull request #767 from lausaa/master

python3.6+ is needed for casctl

utils/casctl

@@ -10,8 +10,8 @@ import sys
 
 import opencas
 
-if sys.version_info < (3, 5):
-    raise RuntimeError('At least Python 3.5 is required')
+if sys.version_info < (3, 6):
+    raise RuntimeError('At least Python 3.6 is required')
 
 def eprint(*args, **kwargs):
     print(*args, file=sys.stderr, **kwargs)