This release contains no changes to 7.x-1.1, other than those necessary to resolve the security vulnerability SA-CONTRIB-2019-080.
Other changes had previously been made to the 7.x-1.x branch. Those were not yet tested and ready to include in a stable tagged release. So, those other changes have been temporarily rolled back to enable the prompt creation of this security release.
The initial release contained a bug where complex trees would sometimes grant permissions to not only the designated target group, but also the target's siblings. This has been fixed and a simple cache rebuild will make sure everything is working as intended. If you had simple parent-child relationships set up, you were likely unaffected. But it's advisable to upgrade nonetheless.
Not too bad considering we went straight to a full release.