Avoid inheritance from object

Avoid inheritance from object
to fix WPS306 linting errors.

```
WPS306 Found explicit `object` base class: ...
```

Author: ivanovmg

classes/_typeclass.py

@@ -109,7 +109,7 @@
 
 .. code:: python
 
-    >>> class WithField(object):
+    >>> class WithField:
     ...    field: str = 'with field'
 
     >>> assert example(WithField()) == 'with field'
@@ -256,7 +256,7 @@ class Supports(Generic[_AssociatedTypeDef]):
 
       >>> from classes import typeclass, Supports
 
-      >>> class ToJson(object):
+      >>> class ToJson:
       ...     ...
 
       >>> @typeclass(ToJson)

classes/contrib/mypy/features/supports.py

@@ -12,7 +12,7 @@
 
 
 @final
-class VariadicGeneric(object):
+class VariadicGeneric:
     """
     Variadic generic support for ``Supports`` type.
 

classes/contrib/mypy/features/typeclass.py

@@ -30,7 +30,7 @@
 
 
 @final
-class TypeClassReturnType(object):
+class TypeClassReturnType:
     """
     Adjust argument types when we define typeclasses via ``typeclass`` function.
 
@@ -105,7 +105,7 @@ def _process_typeclass_def_return_type(
 
 
 @final
-class TypeClassDefReturnType(object):
+class TypeClassDefReturnType:
     """
     Callback for cases like ``@typeclass(SomeType)``.
 
@@ -172,7 +172,7 @@ def instance_return_type(ctx: MethodContext) -> MypyType:
 
 
 @final
-class InstanceDefReturnType(object):
+class InstanceDefReturnType:
     """
     Class to check how instance definition is created.
 

classes/contrib/mypy/typeops/call_signatures.py

@@ -17,7 +17,7 @@
 
 
 @final
-class SmartCallSignature(object):
+class SmartCallSignature:
     """
     Infers the ``__call__`` signature of a typeclass.
 

classes/contrib/mypy/typeops/mro.py

@@ -11,7 +11,7 @@
 
 
 @final
-class MetadataInjector(object):
+class MetadataInjector:
     """
     Injects fake ``Supports[TypeClass]`` parent classes into ``mro``.
 

docs/pages/concept.rst

@@ -310,7 +310,7 @@ In other words, it can fallback to more common types:
   ... def example(instance) -> str:
   ...     ...
 
-  >>> class A(object):
+  >>> class A:
   ...     ...
 
   >>> class B(A):
@@ -505,7 +505,7 @@ to have only subtypes of some specific types during typechecking
 
   >>> from classes import typeclass
 
-  >>> class A(object):
+  >>> class A:
   ...     ...
 
   >>> class B(A):

docs/pages/why.rst

@@ -58,7 +58,7 @@ super type to make ``len`` method available to your type:
 
   >>> import abc
 
-  >>> class HasLength(object):
+  >>> class HasLength:
   ...     @abc.abstractmethod
   ...     def len(self) -> int:
   ...         """You have to implement this method to get the length."""
@@ -96,7 +96,7 @@ For example, imagine you have a typical domain ``Person`` class:
 
   >>> from typing import Sequence
 
-  >>> class Person(object):
+  >>> class Person:
   ...     def become_friends(self, friend: 'Person') -> None:
   ...          ...
   ...
@@ -111,7 +111,7 @@ And our library requires this extra API:
 
 .. code:: diff
 
-  --- class Person(object):
+  --- class Person:
   +++ class Person(JSONSerializable):
 
   +++ def to_json(self) -> str:

setup.cfg

@@ -100,6 +100,7 @@ ignore_errors = false
 ignore_missing_imports = true
 implicit_reexport = false
 local_partial_types = true
+strict = true
 strict_optional = true
 strict_equality = true
 no_implicit_optional = true

tests/test_typeclass/test_cache.py

@@ -8,7 +8,7 @@ def my_typeclass(instance) -> int:
     """Example typeclass."""
 
 
-class _MyABC(object, metaclass=ABCMeta):
+class _MyABC(metaclass=ABCMeta):
     @abstractmethod
     def get_number(self) -> int:
         """Example abstract method."""
@@ -20,7 +20,7 @@ def get_number(self) -> int:
         return 1
 
 
-class _MyRegistered(object):
+class _MyRegistered:
     def get_number(self) -> int:
         """Would be registered in ``_MyABC`` later."""
         return 2

tests/test_typeclass/test_protocols.py

@@ -18,7 +18,7 @@ def _str_type(instance: str, other: str) -> str:
     return instance + other
 
 
-class _CustomSized(object):
+class _CustomSized:
     def __len__(self) -> int:
         return 2