Add python_requires to help pip
When old Python versions are dropped, this will help pip install the right version for people still running those old Python versions.
For more info on how this works:
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@@ -21,6 +21,7 @@ if __name__ == "__main__":
author_email='ehs@pobox.com',
packages=['twarc',],
description='Archive tweets from the command line',
+ python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
install_requires=dependencies,
setup_requires=['pytest-runner'],
tests_require=['pytest'],
