Update dependencies; test on py3.9; drop python 3.5 support

deploy/arch/PKGBUILD.template

@@ -8,7 +8,7 @@ arch=('any')
 url="https://instaloader.github.io/"
 license=('MIT')
 groups=()
-depends=('python>=3.5' 'python-requests>=2.4')
+depends=('python>=3.6' 'python-requests>=2.4')
 makedepends=('python-setuptools')
 options=('!emptydirs')
 source=($pkgname-$pkgver.tar.gz::https://codeload.github.com/instaloader/instaloader/tar.gz/v$pkgver)

deploy/windows/create_exe.py

@@ -44,7 +44,7 @@ with open('__main__.py', 'w+') as f:
     f.writelines(lines)
 
 # install dependencies and invoke PyInstaller
-commands = ["pip install pipenv==2020.6.2",
+commands = ["pip install pipenv==2020.11.15",
             "pipenv sync --dev",
             "pipenv run pyinstaller --log-level=DEBUG instaloader.spec"]