docker run --rm -ti --entrypoint=pip3 python:3.8 install 'fluent-logger<0.10.0,>=0.9.3'
Unable to find image 'python:3.8' locally
3.8: Pulling from library/python
Digest: sha256:f2157e214fc01e5cc4a1991728870fef889a7034a117886429bd9ce8edc129ab
Status: Downloaded newer image for python:3.8
ERROR: Could not find a version that satisfies the requirement fluent-logger<0.10.0,>=0.9.3 (from versions: 0.1.0, 0.1.1, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.6.0, 0.6.1, 0.6.2, 0.7.0)
ERROR: No matching distribution found for fluent-logger<0.10.0,>=0.9.3

 docker run --rm -ti --entrypoint=pip3 python:3.7 install 'fluent-logger<0.10.0,>=0.9.3'
Collecting fluent-logger<0.10.0,>=0.9.3
  Downloading https://files.pythonhosted.org/packages/7b/bd/ca035aa263f98d0d5ca3b6ffbaa8289eac5f97e1fd07f04baa7c3e088d5d/fluent_logger-0.9.3-py2.py3-none-any.whl
Collecting msgpack (from fluent-logger<0.10.0,>=0.9.3)
  Downloading https://files.pythonhosted.org/packages/25/f8/6009e73f5b08743718d0660a18ecbc44b013a68980347a3835b63e875cdb/msgpack-0.6.2-cp37-cp37m-manylinux1_x86_64.whl (243kB)
    100% |████████████████████████████████| 245kB 3.7MB/s 
Installing collected packages: msgpack, fluent-logger
Successfully installed fluent-logger-0.9.3 msgpack-0.6.2
You are using pip version 19.0.3, however version 19.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.