Hello,
We have added your CoolReader application on F-Droid. If the APK is built for all arch, the resulting APK is 12 MB, yet when building it for a single arch results in a 3.7 MB APK. Since mobile devices are usually limited in terms of disk space, I think it would be better to provide a separate APK for each arch., in order to be able to achieve this, I suggest that you add another least-significat digit to the vercode, that least-significant digit will be used to differentiate between the different archs. So for example your last version had vercode of 892, my suggestion that it would be 8920.
That zero would be replaced when building the APK by:
1 => armeabi
2 => armeabi-v7a
3 => x86
4 => mips
5 => arm64-v8a
6 => x86_64
7 => mips64
All further builds will be available as a separate per-ABI APKs.
Could you push your changes to git ? SF SCM is up & running again now.