Notice: xlsx package relocation

[tealeg]

Hi everyone,

Yesterday I made the decision to move my XLSX package from GitHub to Codeberg.  I won't bore you with the politics, but the net effect is:

- github.com/tealeg/xlsx/v3 should still work, but will no longer be maintained.

- codeberg.org/tealeg/xlsx/v4 is compatible with v3 except that the package include path has changed. 

- all issues and PRs should now be made at codeberg.org and the github repo is archived.

I don't know how many people are still using this, but its over 6k stars on GitHub and has been publicly available for 15 years, so I'm guessing there's still someone who needs this. 

Eat a peach!

-- 

Geoff  Teale.  (tealeg)