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swh-web: Add Django >= 2.x support

Authored by anlambert on Jan 14 2020, 1:32 PM.

Description

swh-web: Add Django >= 2.x support

Fix swh-web execution when using Django >= 2 as some error handler signatures
have changed since Django 1.x

Add a new tox job to build swh-web with latest Django 2.x version.