Update sphinx from 1.6.5 to 1.6.6 (#3114)
Update sphinx from 1.6.5 to 1.6.6 (#3114)


edmorley/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder