Add myself to maintainers

[BetaCat0]

I’m @BetaCat0 . Recently I’ve contributed several PRs on Gitea. I think Gitea is an interesting project and I’m hoping to join the org for maintaining & developing :)

PRs list here:

https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3ABetaCat0+is%3Aclosed (closed)
https://github.com/go-gitea/gitea/pulls/BetaCat0 (underway)

[codecov-io]

Codecov Report

Merging #5101 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5101      +/-   ##
==========================================
+ Coverage   37.42%   37.43%   +0.01%     
==========================================
  Files         306      306              
  Lines       45381    45381              
==========================================
+ Hits        16985    16990       +5     
+ Misses      25944    25941       -3     
+ Partials     2452     2450       -2

Impacted Files	Coverage Δ
models/repo_indexer.go	54.23% <0%> (+2.11%)	⬆️

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[lunny]

@BetaCat0 please also send a same PR to other repositories on go-gitea organization.