chore: resolve dependency conflict

[nakamasato]

Close #22

requests 2.22.0 requires urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1, but you'll have urllib3 1.26.5 which is incompatible.

request 2.25.0 updated the dependency on urllib3

Notes

before

pip install -r requirements.txt
Collecting certifi==2019.9.11
  Using cached certifi-2019.9.11-py2.py3-none-any.whl (154 kB)
Collecting chardet==3.0.4
  Using cached chardet-3.0.4-py2.py3-none-any.whl (133 kB)
Collecting gitdb2==2.0.6
  Using cached gitdb2-2.0.6-py2.py3-none-any.whl (63 kB)
Collecting GitPython==3.0.4
  Using cached GitPython-3.0.4-py3-none-any.whl (454 kB)
Collecting idna==2.8
  Using cached idna-2.8-py2.py3-none-any.whl (58 kB)
Collecting mistune==0.8.4
  Using cached mistune-0.8.4-py2.py3-none-any.whl (16 kB)
Collecting PyYAML==5.4
  Using cached PyYAML-5.4.tar.gz (174 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Collecting requests==2.22.0
  Using cached requests-2.22.0-py2.py3-none-any.whl (57 kB)
Collecting smmap2==2.0.5
  Using cached smmap2-2.0.5-py2.py3-none-any.whl (24 kB)
Collecting textwrap3==0.9.2
  Using cached textwrap3-0.9.2-py2.py3-none-any.whl (12 kB)
Collecting urllib3==1.26.5
  Using cached urllib3-1.26.5-py2.py3-none-any.whl (138 kB)
Collecting yapf==0.28.0
  Using cached yapf-0.28.0-py2.py3-none-any.whl (180 kB)
Building wheels for collected packages: PyYAML
  Building wheel for PyYAML (PEP 517) ... done
  Created wheel for PyYAML: filename=PyYAML-5.4-cp39-cp39-macosx_12_0_arm64.whl size=45531 sha256=35df1276d21a5962d14a497fbc6a5893adeceb240193dd10c17890c513c9c000
  Stored in directory: /Users/m.naka/Library/Caches/pip/wheels/11/a6/0e/9fdfb1aa0e17ad2702af1b2768ac6b6e40a41028ac309ab6e0
Successfully built PyYAML
Installing collected packages: certifi, chardet, smmap2, gitdb2, GitPython, idna, mistune, PyYAML, urllib3, requests, textwrap3, yapf
ERROR: After October 2020 you may experience errors when installing or updating packages. This is because pip will change the way that it resolves dependency conflicts.

We recommend you use --use-feature=2020-resolver to test your packages with the new resolver before it becomes the default.

requests 2.22.0 requires urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1, but you'll have urllib3 1.26.5 which is incompatible.
Successfully installed GitPython-3.0.4 PyYAML-5.4 certifi-2019.9.11 chardet-3.0.4 gitdb2-2.0.6 idna-2.8 mistune-0.8.4 requests-2.22.0 smmap2-2.0.5 textwrap3-0.9.2 urllib3-1.26.5 yapf-0.28.0
WARNING: You are using pip version 20.2.3; however, version 22.2.2 is available.
You should consider upgrading via the '/Users/m.naka/repos/duo-labs/markdown-to-confluence/venv/bin/python -m pip install --upgrade pip' command.