update rational reference

README.md

@@ -30,4 +30,4 @@ julia> pFq((1, 2+im), (3.5, ), exp(im*π/3)) # ₂F₁ at that special point in
 
 [2] J. W. Pearson, S. Olver and M. A. Porter, [Numerical methods for the computation of the confluent and Gauss hypergeometric functions](https://doi.org/10.1007/s11075-016-0173-0), *Numer. Algor.*, **74**:821–866, 2017.
 
-[3] R. M. Slevinsky, [Fast and stable rational approximation of generalized hypergeometric functions](https://arxiv.org/abs/2307.06221), arXiv:2307.06221, 2023.
+[3] R. M. Slevinsky, [Fast and stable rational approximation of generalized hypergeometric functions](https://doi.org/10.1007/s11075-024-01808-w), *Numer. Algor.*, 2024.