buildout: Fix Sphinx install on Python2
Else it is failing as: Got j1m.sphinxautozconfig 0.1.0. Getting distribution for 'sphinx_rtd_theme'. Got sphinx-rtd-theme 0.5.2. Version and requirements information containing docutils: Base installation request: 'Sphinx', 'docutils', 'ZODB', 'sphinxcontrib_zopeext', 'j1m.sphinxautozconfig', 'sphinx_rtd_theme' Requirement of sphinx_rtd_theme: docutils<0.17 Requirement of j1m.sphinxautozconfig: docutils Requirement of Sphinx: docutils<0.17,>=0.12 While: Installing sphinx. Error: There is a version conflict. We already have: docutils 0.17.1 but sphinx-rtd-theme 0.5.2 requires 'docutils<0.17'. (see e.g. https://travis-ci.com/github/zopefoundation/ZODB/jobs/499760337) Suggested by @d-maurer.
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