Update README.md

Update article reference

README.md

@@ -123,18 +123,15 @@ print(df)
 
 We kindly ask that you cite our paper if you use the ManyWells datasets or code in an academic work. You can cite it as shown in the BibTex entry below.
 
-Note that the paper is currently in review and that the reference below is to a preprint.
-
 ```
 @article{Grimstad2025,
 	title = {{ManyWells: Simulation of Multiphase Flow in Thousands of Wells}},
-	author = {Grimstad, Bjarne and Lundby, Erlend and Andersson, Henrik},
-	journal = {SSRN Electronic Journal},
-	issn = {1556-5068},
-	doi = {10.2139/ssrn.5256125},
+	author = {Bjarne Grimstad and Erlend Lundby and Henrik Andersson},
+	journal = {Geoenergy Science and Engineering},
+	pages = {214226},
 	year = {2025},
-	pages = {1--47},
-	note = {Preprint}
+	issn = {2949-8910},
+	doi = {https://doi.org/10.1016/j.geoen.2025.214226},
 }
 ```