[2.7] bpo-30380: Pin the version of Sphinx used to build the docs (GH…

[2.7] bpo-30380: Pin the version of Sphinx used to build the docs (GH… · python/cpython@97eb2a7

Original file line number	Diff line number	Diff line change
`@@ -28,7 +28,9 @@ matrix:`
`28`	`28`	`- TESTING=docs`
`29`	`29`	`before_script:`
`30`	`30`	`- cd Doc`
`31`		`- - pip install -U Sphinx`
	`31`	`+# Sphinx is pinned so that new versions that introduce new warnings won't suddenly cause build failures.`
	`32`	`+# (Updating the version is fine as long as no warnings are raised by doing so.)`
	`33`	`+ - python -m pip install sphinx~=1.5.6`
`32`	`34`	`script:`
`33`	`35`	`- make check suspicious html SPHINXOPTS="-q -W"`
`34`	`36`