- State in README.rst and setup.py metainfo that we require Python>=3.5
- Let Travis-CI test against newer versions of Python
- Let instaloader --help show where to report issues
With --quiet activated, user interaction is disabled, i.e. no messages
are printed (except errors) and if login credentials are needed but not
given, instaloader fails.
We used to say in the project description text that we need Python>=3.2,
but I just noted that we use print() flush parameter, which was
introduced with python 3.3. Pylint would have warned that our code would
fail with Python 3.2.