Bump advtrains from e04c21b to 81cd305

Bumps [advtrains](https://github.com/minetest-mirrors/advtrains) from `e04c21b` to `81cd305`.
- [Release notes](https://github.com/minetest-mirrors/advtrains/releases)
- [Commits](e04c21be78...81cd305aa0)

Signed-off-by: dependabot[bot] <support@github.com>
This commit is contained in:
dependabot[bot] 2021-05-04 05:44:32 +00:00 committed by Buckaroo Banzai
parent a3b0798350
commit 440544d87f

@ -1 +1 @@
Subproject commit e04c21be78f6c915537f7dc8fdbf8110d7eadcd0
Subproject commit 81cd305aa04f7af0bd812c5addb8673d5d633b44