[issue2551038] travis-ci failures installing sphinx 2.0 in 3.5 and 3.6 python (works in 2.7 and 3.4)

New submission from John Rouillard:

Looks like sphinx released version 2.0 on the 28 of March. This cause
the 3.5 and 3.6 python virtual environments to fail to deploy.

I changed the .travis.yml file to return it to version 1.8.5.

Sphinx is requited to build xapian text indexer.

All environments now are getting created correctly.

----------
assignee: rouilj
components: Infrastructure
messages: 6448
nosy: rouilj
priority: high
severity: major
status: new
title: travis-ci failures installing sphinx 2.0 in 3.5 and 3.6 python (works in 2.7 and 3.4)
type: crash
versions: devel

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