Log Message:
py-sphinx: updated to 1.6.7

Release 1.6.7:

Bugs fixed
----------
* 1922: html search: Upper characters problem in French
* 4412: Updated jQuery version from 3.1.0 to 3.2.1
* 4438: math: math with labels with whitespace cause html error
* 2437: make full reference for classes, aliased with "alias of"
* 4434: pure numbers as link targets produce warning
* 4477: Build fails after building specific files
* 4449: apidoc: include "empty" packages that contain modules
* 3917: citation labels are tranformed to ellipsis
* 4501: graphviz: epub3 validation error caused if graph is not clickable
* 4514: graphviz: workaround for wrong map ID which graphviz generates
* 4525: autosectionlabel does not support parallel build
* 3953: Do not raise warning when there is a working intersphinx inventory
* 4487: math: ValueError is raised on parallel build. Thanks to jschueller.
* 2372: autosummary: invalid signatures are shown for type annotated functions
* 3942: html: table is not aligned to center even if :align: center