5925: Add note in README about how to convert shallow to full clone r=Jupeyy a=def-

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## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Dennis Felsing <dennis@felsin9.de>
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bors[bot] 2022-10-10 15:50:58 +00:00 committed by GitHub
commit 693d0ce33e
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@ -26,7 +26,7 @@ To clone this repository with history since we moved the libraries to https://gi
git clone --shallow-exclude=included-libs https://github.com/ddnet/ddnet
To clone the libraries if you have previously cloned DDNet without them:
To clone the libraries if you have previously cloned DDNet without them, or if you require the ddnet-libs history instead of a shallow clone:
git submodule update --init --recursive