Fix CITATION.cff

CITATION.cff

@@ -1,12 +1,15 @@
-cff-version: 1.1.0
-message: If you refer to this software in a publication, please cite it as below.
+cff-version: 1.2.0
+title: ISIMIP Files API
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
 authors:
   - family-names: Klar
-    given-names:  Jochen
-    orcid:        https://orcid.org/0000-0002-5883-4273
+    given-names: Jochen
+    orcid: 'https://orcid.org/0000-0002-5883-4273'
   - family-names: Mengel
-    given-names:  Matthias
-    orcid:        https://orcid.org/0000-0001-6724-9685
-title: ISIMIP Files API
-license: MID
-repository-code: https://github.com/ISI-MIP/isimip-files-api
+    given-names: Matthias
+    orcid: 'https://orcid.org/0000-0001-6724-9685'
+repository-code: 'https://github.com/ISI-MIP/isimip-files-api'
+license: MIT