Fix appveryor pipelines by loqs · Pull Request #596 · html5lib/html5lib-python

• Change appveryor's image to Visual Studio 2017 from Visual Studio 2022. Visual Studio 2017 is the most recent Visual Studio image still containing python 3.7.
  • Alternatives:
    • Install python 3.7 on Visual Studio 2022.
    • Switch to a Ubuntu based image.
• Add upper bound < 5.0.0 to lxml for python 2.7 in requirements-optional.txt.
  • Alternatives:
    • Use an upper bound of < 5.1.0 for Linux and 5.1.0 for Windows.
    • Use an upper bound of 5.1.0 and attempt to build lxml from source.
    • Switch to a Ubuntu based image.

@cclauss as the last person to touch .appveyor.yml.

I am not a maintainer, so I cannot approve the workflows, etc.

@cclauss I apologize for not being clear. Were all appveryor pipelines passing for 4a87368? I tried checking the relevant logs however they are no longer available. Do my suggested changes seem reasonable to you? I am not familiar with appveyor.