fix: bad edit on get_child

Author: MilesCranmer

src/Node.jl

@@ -217,7 +217,7 @@ end
 Return the `i`-th child of a node (1-indexed).
 """
 @inline function get_child(n::AbstractNode{D}, i::Int) where {D}
-    return get_children(n, i)
+    return get_children(n)[i]
 end
 
 """