peakutils missing in requirements

Hi Greg, just updated your PyFstat and had to add peakutils to my local installation, which was not in your requirements yet. A nice trivial change to test my very first merge request with gitlab, hope it works as intended...

PS: For a change, I also tried to make these changes completely within the web interface. Seems to have worked in principle, I just didn't find an option to squash the two small commits, sorry.

enabled an automatic merge when the pipeline for 29475371 succeeds

canceled the automatic merge

mentioned in commit f5634a0a

merged

Thanks David, I'm merging it, but I'm new to this end of merging so if it gets rejected it's because I don't quite understand what I'm doing.