change README: recursive git submodule update

now that leopard uses sse2neon as a submodule, we need recursive clone.
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Csaba Kiraly 2022-05-17 19:29:38 +02:00 committed by Csaba Kiraly
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@ -39,7 +39,7 @@ When nim-leopard is installed with `nimble install leopard`, or as a dependency
If the nim-leopard repo is cloned directly, then before running `nimble develop` or `nimble install` in the root of the clone, it's necessary to init the submodule
```text
$ git submodule update --init
$ git submodule update --init --recursive
```
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