Update CHANGES.md, preparing 4.13.0

gap-system / gap

Main development repository for GAP - Groups, Algorithms, Programming, a System for Computational Discrete Algebra

https://www.gap-system.org

GNU General Public License v2.0

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Closed fingolfin closed 2 months ago

fingolfin commented 2 months ago

Also tweak dev/releases/release_notes.py to output suitable month/year

I plan to release GAP 4.13.0 today/tomorrow (Friday).