add linting stubs with flake8-pyi and check for unused imports (#186)

django-stubs/template/backends/utils.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Any
 
 from django.http.request import HttpRequest
 from django.utils.safestring import SafeText

django-stubs/template/defaultfilters.pyi

@@ -2,7 +2,7 @@ from datetime import date as _date, datetime, time as _time
 from typing import Any, Callable, Dict, List, Optional, Union
 
 from django.utils.safestring import SafeText
-from django.utils.html import escape as escape
+from django.utils.html import escape as escape  # noqa: F401
 
 register: Any
 

django-stubs/template/loader.pyi

@@ -1,8 +1,8 @@
 from typing import Any, Dict, List, Optional, Union
-from . import engines as engines
+from . import engines as engines  # noqa: F401
 
 from django.http.request import HttpRequest
-from django.template.exceptions import TemplateDoesNotExist as TemplateDoesNotExist
+from django.template.exceptions import TemplateDoesNotExist as TemplateDoesNotExist  # noqa: F401
 
 def get_template(template_name: str, using: Optional[str] = ...) -> Any: ...
 def select_template(template_name_list: Union[List[str], str], using: Optional[str] = ...) -> Any: ...

django-stubs/template/response.pyi

@@ -7,7 +7,6 @@ from django.http.request import HttpRequest
 from django.template.base import Template
 from django.template.context import RequestContext
 from django.test.client import Client
-from django.utils.functional import SimpleLazyObject
 
 from django.http import HttpResponse