Module not found by `pkg.go.dev`

See https://pkg.go.dev/git.ufz.de/OESA/go-mastiff

I suspect the problem is that the repo address is all lower case https://git.ufz.de/oesa/go-mastiff, while in go.mod, the module line looks like this: module git.ufz.de/OESA/go-mastiff

Try whether changing to lower case in go.mod helps.

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