Fix very minor packaging issues

- 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

.travis.yml

@@ -2,7 +2,9 @@ language: python
 python:
  - "3.5"
  - "3.5-dev"
+ - "3.6"
  - "3.6-dev"
+ - "3.7-dev"
  - "nightly"
 install:
  - pip install pylint requests

README.rst

@@ -6,7 +6,7 @@ Installation
 ------------
 
 instaloader is written in Python, thus ensure having
-`Python <https://www.python.org/>`__ (at least version 3.3) installed.
+`Python <https://www.python.org/>`__ (at least version 3.5) installed.
 
 If you intend to use this tool under Windows, it is recommended
 to install

instaloader.py

@@ -685,7 +685,8 @@ def download_profiles(profilelist: List[str], username: Optional[str] = None, pa
         save_session(session, username, sessionfile, quiet=quiet)
 
 def main():
-    parser = ArgumentParser(description=__doc__)
+    parser = ArgumentParser(description=__doc__,
+                            epilog="Report issues at https://github.com/Thammus/instaloader/issues.")
     parser.add_argument('profile', nargs='*',
                         help='Name of profile to download; @<profile> to download all followees of '
                              '<profile>; or the special targets :feed-all or :feed-liked to '

setup.py

@@ -19,7 +19,7 @@ setup(
                 'profile.',
     long_description=open('README.rst').read(),
     install_requires=['requests>=2.4'],
-    python_requires='>=3.3',
+    python_requires='>=3.5',
     entry_points={'console_scripts': ['instaloader=instaloader:main']},
     zip_safe=True,
     keywords='instagram downloader',