#278 Fix compatability with python 3.8 (#280)

inputremapper/input_event.py

@@ -27,7 +27,7 @@ from typing import Tuple
 from inputremapper.exceptions import InputEventCreationError
 
 
-@dataclass(frozen=True, slots=True)
+@dataclass(frozen=True)  # Todo: add slots=True as soon as python 3.10 is in common distros
 class InputEvent:
     """
     the evnet used by inputremapper

tests/unit/test_input_event.py

@@ -91,10 +91,10 @@ class TestInputEvent(unittest.TestCase):
         )
         self.assertEqual(e1.type_and_code, (evdev.ecodes.EV_KEY, evdev.ecodes.BTN_LEFT))
 
-        with self.assertRaises(TypeError):
+        with self.assertRaises(FrozenInstanceError):  # would be TypeError on a slotted class
             e1.event_tuple = (1, 2, 3)
 
-        with self.assertRaises(TypeError):
+        with self.assertRaises(FrozenInstanceError):  # would be TypeError on a slotted class
             e1.type_and_code = (1, 2)
 
         with self.assertRaises(FrozenInstanceError):