Binaries not constructed for release v1.2.11

[KrisThielemans]

https://github.com/UCL/PETPVC/releases/tag/v1.2.11

[KrisThielemans]

This could be because this was done by Travis (no longer active), or maybe it had to be done by hand.

[KrisThielemans]

@bathomas any suggestions?

[mcsitter]

Hi,
Unfortunately, I don’t currently have a full build environment available.
Would it be possible to share precompiled binaries (for Linux/macOS/Windows)?

That would be a huge help — thanks a lot!