Merge Release 0.5.2 Changelog into master

[ericholscher]

This is merging the changes from 0.5.2 back into master, so the changelog is up to date.

[ericholscher]

-> git diff --stat 0.5.1 rel-0.5.2
 docs/changelog.rst | 9 +++++++++
 package-lock.json  | 2 +-
 package.json       | 2 +-
 setup.py           | 1 +
 4 files changed, 12 insertions(+), 2 deletions(-)

[ericholscher]

This release is out:

• https://pypi.org/project/sphinx-rtd-theme/0.5.2/
• https://github.com/readthedocs/sphinx_rtd_theme/releases/tag/0.5.2

[ericholscher]

This PR has been updated to now be the changes from 0.5.2 being merged back into master so we don't lose them. 👍