3.2.0

• misc: add Python 3.9 classifier
• core: drop py3.5 from CI and documentation
• ci: run tests in Python 3.9
• ci: fix SDK path in appveyor
• ci: fix VS linker in appveyor
• ci: update python installer script in appveyor
• misc: add compiled windows dll to gitignore
• test: skip SOA non-ascii test due to changes in remote host
• test: fix broken chunked TXT test due to changes in remote host
• test: skip ANY test due to problems with mac
• ci: add action to release wheels to PyPi
• ci: drop AppVeyor
• ci: don't fail fast
• ci: stop testing on Travis
• test: add generic way to check for a CI
• test: relax check
• test: try to avoid spurious CI failures
• ci: test all platforms on GH actions
• ci: build wheels on GH Actions
• build: fix build error on macOS
• ci: explicitly set Python versions to build wheels for
• ci: update cibuildwheel
• ci: re-add IDNA test