pengyuesheng 3b6357dd27 Sync Sphinx requirement
Sync sphinx dependency with global requirements. It caps python 2 since
sphinx 2.0 no longer supports Python 2.7.

Change-Id: I4a4c07ffaacb65e9ee919fb7a0d25de3c0840e12
2019-10-10 14:56:10 +08:00
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2019-10-10 14:56:10 +08:00