Version 1.5.1 is a bugfix release. It was published on the App Store on March 24 2019.
Below is a summary of changes, taken verbatim from the ChangeLog document. For the full story, a list of issues closed for this release is available here on GitHub.
- App no longer crashes during launch on iOS 9.x and below (#332). Thanks to Li Chen Ke and Dennis for reporting the issue.