reference to arXiv 1903.00540

README.md

@@ -111,7 +111,7 @@ Using the code
 You can use CLASS freely, provided that in your publications, you cite
 at least the paper `CLASS II: Approximation schemes <http://arxiv.org/abs/1104.2933>`. Feel free to cite more CLASS papers!
 
-For this modified version of CLASS please also cite <>
+For this modified version of CLASS please also cite <https://arxiv.org/abs/1903.00540>
 
 Support
 -------

changelog.log

@@ -9,7 +9,7 @@
   Author: lesgourg <lesgourg@physik.rwth-aachen.de>
   Date:   Mon Sep 10 18:06:10 2018 +0200
   ----------
-* For more details see REFERENCE
+* For more details see <https://arxiv.org/abs/1903.00540>
 
 1. 'thermodynamics.h'
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