Compat bounds in General do not include XLSX v0.8

[angusmoore]

Compat in Project.toml is:

XLSX = "≥ 0.4.1"

But in General, Compat.toml has XLSX = "0.4.1-0.7" (presumably because when v1 was registered XLSX 0.7 was the latest version?).

I think either Project.toml should be updated to reflect what is in General, or vice versa. I've only quickly looked, but seems to wokr fine with XLSX 0.8, although tests are failing for me regardless of XLSX version (failures seem unrelated - appear to be eg #51, #53). I think the latter option (tagging a new version and updating compat bounds in General to include XLSX 0.8) would be preferable, but I haven't thoroughly tested.