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

setup.py

@@ -3,7 +3,6 @@
 import re
 import sys
 import os
-import platform
 from setuptools import setup
 
 
@@ -19,14 +18,11 @@ def get_version():
     raise SystemExit("Could not find version string.")
 
 
-if sys.version_info < (3, 5):
-    sys.exit('Instaloader requires Python >= 3.5.')
+if sys.version_info < (3, 6):
+    sys.exit('Instaloader requires Python >= 3.6.')
 
 requirements = ['requests>=2.4']
 
-if platform.system() == 'Windows' and sys.version_info < (3, 6):
-    requirements.append('win_unicode_console')
-
 keywords = (['instagram', 'instagram-scraper', 'instagram-client', 'instagram-feed', 'downloader', 'videos', 'photos',
              'pictures', 'instagram-user-photos', 'instagram-photos', 'instagram-metadata', 'instagram-downloader',
              'instagram-stories'])
@@ -47,7 +43,7 @@ setup(
                 'from Instagram.',
     long_description=open(os.path.join(SRC, 'README.rst')).read(),
     install_requires=requirements,
-    python_requires='>=3.5',
+    python_requires='>=3.6',
     entry_points={'console_scripts': ['instaloader=instaloader.__main__:main']},
     zip_safe=False,
     keywords=keywords,
@@ -58,10 +54,10 @@ setup(
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3 :: Only',
         'Topic :: Internet',
         'Topic :: Multimedia :: Graphics'