Update citation information CITATION.cff and BibTeX in README

Author: seisman

CITATION.cff

@@ -76,9 +76,9 @@ authors:
   family-names: Wessel
   affiliation: University of Hawaiʻi at Mānoa, USA
   orcid: https://orcid.org/0000-0001-5708-7336
-date-released: 2025-02-15
-doi: 10.5281/zenodo.14868324
+date-released: 2025-03-31
+doi: 10.5281/zenodo.15071586
 license: BSD-3-Clause
 repository-code: https://github.com/GenericMappingTools/pygmt
 type: software
-version: 0.14.2
+version: 0.15.0

README.md

@@ -137,7 +137,7 @@ Feel free to cite our work in your research using the following BibTeX:
 
 ```
 @software{
-  pygmt_2025_14868324,
+  pygmt_2025_15071586,
   author       = {Tian, Dongdong and
                   Uieda, Leonardo and
                   Leong, Wei Ji and
@@ -157,12 +157,12 @@ Feel free to cite our work in your research using the following BibTeX:
                   Quinn, Jamie and
                   Wessel, Paul},
   title        = {{PyGMT: A Python interface for the Generic Mapping Tools}},
-  month        = feb,
+  month        = mar,
   year         = 2025,
   publisher    = {Zenodo},
-  version      = {0.14.2},
-  doi          = {10.5281/zenodo.14868324},
-  url          = {https://doi.org/10.5281/zenodo.14868324}
+  version      = {0.15.0},
+  doi          = {10.5281/zenodo.15071586},
+  url          = {https://doi.org/10.5281/zenodo.15071586}
 }
 ```