Bump To 3.9 (3.2.0)

[HassanAbouelela]

Description

This PR bumps the pypi package to 3.2.0 and python version 3.9. It introduces no changed functionality for end-users.

Changes

• Adds 3.9 to all relevant CI
• Adds 3.9 to package setup
• Drops 3.5
• Fixes CI bugs which I assume were introduced by changes upstream (f7b575b, 1e26de2)
• Switches app veyor install script to use exes because the msi installers no longer exist as far as I could tell
• Updates one test which broke due to changes in the domain used for the test (9c2a6d4)
• Removes one test which broke due to changes in the domain used for the test (I couldn't find a replacement) (bfb81ab)
• Fixes Mac CI
• Adds all of the above to the changelog

CI Runs

Here are my successful CI runs: AppVeyor Travis Mac CI

Suggestions

I do have some minor suggestions to address the points about tests. Currently, the tests use sites from all over the internet, which (I assume) you have no control over, leading to tests just breaking over time. I suggest that you either only use domains you control, or more feasibly, run a local DNS server from the test suite so you can have full control over the conditions. I can't say how easy that'll be, but it's definitely easier than scouring the internet and hoping sites don't change their DNS too frequently.

[HassanAbouelela]

Just a slight hiccup in the python installation, but I'll look into fixing that.

Edit: Not really sure. Maybe it has to do with the config? 3.9(.1) should be supported on AV, and it does work in my copy.

[HassanAbouelela]

App veyor is working again, I think that's everything.

[saghul]

Awesome! I triggered GH actions as well. 🤞

[saghul]

Reworded the commits and landed in master, thank you so much!