Updated citation info in documentation

Author: lindonroberts

docs/advanced.rst

@@ -107,5 +107,5 @@ References
 ----------
 
 .. [CFMR2018]   
-   C. Cartis, J. Fiala, B. Marteau and L. Roberts, `Improving the Flexibility and Robustness of Model-Based Derivative-Free Optimization Solvers <https://arxiv.org/abs/1804.00154>`_, technical report, University of Oxford, (2018).
+   Coralia Cartis, Jan Fiala, Benjamin Marteau and Lindon Roberts, `Improving the Flexibility and Robustness of Model-Based Derivative-Free Optimization Solvers <https://doi.org/10.1145/3338517>`_, *ACM Transactions on Mathematical Software*, 45:3 (2019), pp. 32:1-32:41 [`preprint <https://arxiv.org/abs/1804.00154>`_] 
 

docs/build/doctrees/advanced.doctree

@@ -1,4 +1,4 @@
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