Remove use of slots in dataclasses (#44)

Support for slots in dataclasses was added in 3.10. The workaround we had
wasn’t working correctly with the type checker.

command_line_assistant/config.py

@@ -41,24 +41,7 @@
 """
 
 
-def dataclass(cls, slots=True):
-    """Custom dataclass decorator to mimic the behavior of dataclass for Python 3.9"""
-    try:
-        return dataclasses.dataclass(cls, slots=slots)
-    except TypeError:
-
-        def wrap(cls):
-            # Create a new dict for our new class.
-            cls_dict = dict(cls.__dict__)
-            field_names = tuple(name for name in cls_dict.keys())
-            # The slots for our class
-            cls_dict["__slots__"] = field_names
-            return dataclasses.dataclass(cls)
-
-        return wrap(cls)
-
-
-@dataclass
+@dataclasses.dataclass
 class LoggingSchema:
     """This class represents the [logging] section of our config.toml file."""
 
@@ -79,7 +62,7 @@ def __post_init__(self):
         self.file = Path(self.file).expanduser()
 
 
-@dataclass
+@dataclasses.dataclass
 class OutputSchema:
     """This class represents the [output] section of our config.toml file."""
 
@@ -91,7 +74,7 @@ def __post_init__(self):
         self.file = Path(self.file).expanduser()
 
 
-@dataclass
+@dataclasses.dataclass
 class HistorySchema:
     """This class represents the [history] section of our config.toml file."""
 
@@ -105,15 +88,15 @@ def __post_init__(self):
         self.file = Path(self.file).expanduser()
 
 
-@dataclass
+@dataclasses.dataclass
 class BackendSchema:
     """This class represents the [backend] section of our config.toml file."""
 
     endpoint: str = "http://0.0.0.0:8080/v1/query"
     verify_ssl: bool = True
 
 
-@dataclass
+@dataclasses.dataclass
 class Config:
     """Class that holds our configuration file representation.