Adding variation for compatibility with Python3 < 3.10

Reviewed-on: veles_labs/pyveles#9

src/veles/device/generic.py

@@ -3,8 +3,10 @@ from dataclasses import dataclass
 from typing import Dict, Any
 from abc import ABC, abstractmethod
 
+import sys
+py310 = sys.version_info.minor >= 10 or sys.version_info.major > 3
 
-@dataclass(slots=True)
+@dataclass(**({"slots": True} if py310 else {}))
 class ReadoutErrorCounter:
     """Class used to track readout errors"""