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

.github/workflows/unit-test.yml

@@ -28,14 +28,13 @@ jobs:
         pip install '.[dev]'
     - name: Lint with flake8
       run: |
-        # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --show-source --statistics
     - name: Lint with black
       run: |
         black . --check --diff
-    # - name: Static type test with mypy
-    #   run: |
-    #     mypy
+    - name: Static type test with mypy
+      run: |
+        mypy -p waybackpy -p tests
     - name: Test with pytest
       run: |
         pytest