git clone URL in readme: https instead of ssh?

Hi Greg, Simone asked me for help in cloning the repo today. The readme recommends $ git clone git@gitlab.aei.uni-hannover.de:GregAshton/PyFstat.git which requires an account and public key, whereas git clone https://gitlab.aei.uni-hannover.de/GregAshton/PyFstat.git should work anonymously (and did for him).

Sounds good?

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