Upgrade Flask from 1.0 to >= 2.0.1 in requirements.txt

[peterdyoon]

When running docker run -p 8888:5000 yourusername/catnip, I got the following error:

Traceback (most recent call last):
  File "/usr/src/app/./app.py", line 1, in <module>
    from flask import Flask, render_template
  File "/usr/local/lib/python3.10/site-packages/flask/__init__.py", line 21, in <module>
    from .app import Flask, Request, Response
  File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 25, in <module>
    from . import cli, json
  File "/usr/local/lib/python3.10/site-packages/flask/json/__init__.py", line 21, in <module>
    from itsdangerous import json as _json
ImportError: cannot import name 'json' from 'itsdangerous' (/usr/local/lib/python3.10/site-packages/itsdangerous/__init__.py)

Based on this website, it seems Flask needs to be upgraded to at least 2.0.1 in the requirements.txt file to make the import work.

Thanks for this tutorial! It's super helpful :)

[peterdyoon]

Just saw #332; closing this one.