gcalcli merged changes from Muness. Use official repo.

The commits from Muness were merged in https://github.com/insanum/gcalcli/commit/cd046dd9f43b8002119aa04d9c6b422d22b5ea93

There have been a number of commits after that to resolve various issues after the merge. Also Muness does not appear to be merging those upstream changes or making new ones, so it's probably best to use the official repo instead of the fork.