Update README.md

Update DOI to v1.6.0

Author: kuberry

README.md

@@ -55,17 +55,17 @@ If you write a paper using results obtained with the help of the Compadre Toolki
 
 If you are using a particular release of the Compadre Toolkit and would like to help others to reproduce your results, please cite that release specifically. A reference to the most recent release is:
 ```
-@software{compadre_toolkit_v1_5_0,
+@software{compadre_toolkit_v1_6_0,
   author       = {Paul Kuberry and
                   Peter Bosler and
                   Nathaniel Trask},
   title        = {Compadre Toolkit},
-  month        = sep,
-  year         = 2022,
+  month        = dec,
+  year         = 2024,
   publisher    = {Zenodo},
-  version      = {v1.5.0},
-  doi          = {10.5281/zenodo.7065758},
-  url          = {https://doi.org/10.5281/zenodo.7065758}
+  version      = {v1.6.0},
+  doi          = {10.5281/zenodo.14279180},
+  url          = {https://doi.org/10.5281/zenodo.14279180}
 }
 ```