Python version and Django version

[pembo13]

@apavlo wanted to confirm what version of Python you were using on the server. For some reason, I had this project in Python 3.4, which is deprecated, and wanted to be sure that that wasn't the version that you were using as well.

Also, should I upgrade to Django 3?

[pembo13]

https://github.com/cmu-db/dbdb.io/tree/issue_68

[apavlo]

We are using Python 3.5.2

How hard would it be to upgrade to Django 3?

[pembo13]

@apavlo

1. updated Django to latest version (3.0.5)
2. updated other requirements
3. cleaned up HTML and Python code
4. fixed test cases
5. fixed Travis build

There's a one time need to do pip uninstall xapian-haystack as the released version is broken for Django 3.

Merge request created: #69

[pembo13]

Updated Django and Travis build