Only use preferred-citation

CITATION.cff

@@ -1,19 +1,22 @@
 cff-version: 1.2.0
 message: "If you use this software, please cite it as below."
-authors:
-- family-names: "Stewart"
-  given-names: "Adam J."
-- family-names: "Robinson"
-  given-names: "Caleb"
-- family-names: "Corley"
-  given-names: "Isaac A."
-- family-names: "Ortiz"
-  given-names: "Anthony"
-- family-names: "Lavista Ferres"
-  given-names: "Juan M."
-- family-names: "Banerjee"
-  given-names: "Arindam"
-title: "TorchGeo: deep learning with geospatial data"
-version: 0.1.0
-date-released: 2021-11-17
-url: "https://github.com/microsoft/torchgeo"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Stewart"
+    given-names: "Adam J."
+  - family-names: "Robinson"
+    given-names: "Caleb"
+  - family-names: "Corley"
+    given-names: "Isaac A."
+  - family-names: "Ortiz"
+    given-names: "Anthony"
+  - family-names: "Lavista Ferres"
+    given-names: "Juan M."
+  - family-names: "Banerjee"
+    given-names: "Arindam"
+  title: "TorchGeo: deep learning with geospatial data"
+  journal: "arXiv preprint arXiv:2111.08872"
+  year: 2021
+  month: 11
+  url: "https://github.com/microsoft/torchgeo"