Applied suggested changes

- preferred-citation is now an object

CITATION.cff

@@ -12,57 +12,57 @@ identifiers:
   - type: url
     value: https://zenodo.org/record/8270947
 preferred-citation:
-  - authors:
-      - family-names: Willighagen
-        given-names: Egon L.
-      - family-names: Mayfield
-        given-names: John W.
-      - family-names: Alvarsson
-        given-names: Jonathan
-      - family-names: Berg
-        given-names: Arvid
-      - family-names: Carlsson
-        given-names: Lars
-      - family-names: Jeliazkova
-        given-names: Nina
-      - family-names: Kuhn
-        given-names: Stefan
-      - family-names: Pluskal
-        given-names: Tomáš
-      - family-names: Rojas-Chertó
-        given-names: Miquel
-      - family-names: Spjuth
-        given-names: Ola
-      - family-names: Torrance
-        given-names: Gilleain
-      - family-names: Evelo
-        given-names: Chris T.
-      - family-names: Guha
-        given-names: Rajarshi
-      - family-names: Steinbeck
-        given-names: Christoph
-    doi: 10.1186/s13321-017-0220-4
-    identifiers:
-      - type: doi
-        value: 10.1186/s13321-017-0220-4
-      - type: url
-        value: http://dx.doi.org/10.1186/S13321-017-0220-4
-      - type: other
-        value: urn:issn:1758-2946
-    title: >-
-      The Chemistry Development Kit (CDK) v2.0: atom typing, depiction,
-      molecular formulas, and substructure searching
-    url: http://dx.doi.org/10.1186/S13321-017-0220-4
-    database: Crossref
-    date-published: 2017-06-06
-    year: 2017
-    month: 6
-    issn: 1758-2946
-    issue: '1'
-    journal: Journal of Cheminformatics
-    languages:
-      - en
-    publisher:
-      name: Springer Science and Business Media LLC
-    type: article
-    volume: '9'
+  authors:
+    - family-names: Willighagen
+      given-names: Egon L.
+    - family-names: Mayfield
+      given-names: John W.
+    - family-names: Alvarsson
+      given-names: Jonathan
+    - family-names: Berg
+      given-names: Arvid
+    - family-names: Carlsson
+      given-names: Lars
+    - family-names: Jeliazkova
+      given-names: Nina
+    - family-names: Kuhn
+      given-names: Stefan
+    - family-names: Pluskal
+      given-names: Tomáš
+    - family-names: Rojas-Chertó
+      given-names: Miquel
+    - family-names: Spjuth
+      given-names: Ola
+    - family-names: Torrance
+      given-names: Gilleain
+    - family-names: Evelo
+      given-names: Chris T.
+    - family-names: Guha
+      given-names: Rajarshi
+    - family-names: Steinbeck
+      given-names: Christoph
+  doi: 10.1186/s13321-017-0220-4
+  identifiers:
+    - type: doi
+      value: 10.1186/s13321-017-0220-4
+    - type: url
+      value: http://dx.doi.org/10.1186/S13321-017-0220-4
+    - type: other
+      value: urn:issn:1758-2946
+  title: >-
+    The Chemistry Development Kit (CDK) v2.0: atom typing, depiction,
+    molecular formulas, and substructure searching
+  url: http://dx.doi.org/10.1186/S13321-017-0220-4
+  database: Crossref
+  date-published: 2017-06-06
+  year: 2017
+  month: 6
+  issn: 1758-2946
+  issue: '1'
+  journal: Journal of Cheminformatics
+  languages:
+    - en
+  publisher:
+    name: Springer Science and Business Media LLC
+  type: article
+  volume: '9'