Changelog for release 2.0.11

[x] Check if any dependencies need updating. - N/A
[x] Update the version constant in src/Requests.php - this PR
[x] Add changelog for the release - this PR
[x] Merge this PR.
[x] Make sure all CI builds are green.
[x] Tag the release against stable and push the tag.
[x] Review the automatically created PR with the GH Pages docs update.
[x] Create a release from the tag (careful, GH defaults to develop!) & copy & paste the changelog to it. Make sure to copy the links to the issues and the links to the GH usernames from the bottom of the changelog!
[x] Merge the GH Pages PR. Note: it is important to do this after the release as otherwise the information about the latest release in the site will not be updated correctly from the GitHub API.
[x] Verify that the website regenerated correctly and is in working order.
[x] Close the milestone.
[x] Open a new milestone for the next release.
[x] If any open PRs/issues which were milestoned for the release did not make it into the release, update their milestone.
[x] Tweet about the release.
[x] Post about it in the WP #core Slack channel.
[x] Open a Trac ticket for WordPress Core to update their copy.
[x] Submit for "Month in WordPress": https://make.wordpress.org/community/month-in-wordpress-submissions/

WordPress / Requests