Update readme.md (#844)

Update basic setup example: replace with V4 run.
NOAA-OWP · Sep 11, 2024 · a0eaeab · a0eaeab
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commit a0eaeab
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diff --git a/readme.md b/readme.md
@@ -214,7 +214,7 @@ python3 -m nwm_routing -f -V4 test_AnA_V4_HYFeature.yaml
    - Run one of the demo examples provided:
       ```shell
       cd test/LowerColorado_TX
-      python -m nwm_routing -f -V3 test_AnA.yaml
+      python3 -m nwm_routing -f -V4 test_AnA_V4_NHD.yaml
       ```
    - The latter is a hybrid (MC + diffusive) routing example that should run within a few minutes at most