Typing (#128)

* fix: CI yml name

* add: mypy configuraion

* add: type annotation to waybackpy modules

* add: type annotation to test modules

* fix: mypy command

* add: types-requests to dev deps

* fix: disable max-line-length

* fix: move pytest.ini into setup.cfg

* add: urllib3 to deps

* fix: Retry (ref: https://github.com/python/typeshed/issues/6893)

* fix: f-string

* fix: shorten long lines

* add: staticmethod decorator to no-self-use methods

* fix: str(headers)->headers_str

* fix: error message

* fix: revert "str(headers)->headers_str" and ignore assignment CaseInsensitiveDict with str

* fix: mypy error

tests/test_utils.py

@@ -6,13 +6,13 @@ from waybackpy.utils import (
 )
 
 
-def test_default_user_agent():
+def test_default_user_agent() -> None:
     assert (
         DEFAULT_USER_AGENT
-        == "waybackpy %s - https://github.com/akamhy/waybackpy" % __version__
+        == f"waybackpy {__version__} - https://github.com/akamhy/waybackpy"
     )
 
 
-def test_latest_version():
+def test_latest_version() -> None:
     package_name = "waybackpy"
     assert latest_version_github(package_name) == latest_version_pypi(package_name)