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Merge pull request #1 from jameshiew/dependabot/pip/django-1.11.23

Bump django from 1.11.22 to 1.11.23

Upgrade to Django 1.11.22

Update Django to be >=1.11.18,<2.0 due to CVE-2019-3498

Update Django due to security issue

Update requests due to security issue

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Update to use Ubuntu 18.04; update pip dependencies; fix Python version

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Update README.md with latest instructions