Fix citation file (#232)

CITATION.cff

@@ -1,33 +1,32 @@
 # YAML 1.2
 ---
 authors: 
-  -
-    family-names: Landry
+  - family-names: Landry
     given-names: Nicholas
-  -
-    family-names: Torres
+    
+  - family-names: Torres
     given-names: Leo
-  -
-    family-names: Iacopini
+    
+  - family-names: Iacopini
     given-names: Iacopo
-  -
-    family-names: Lucas
+    
+  - family-names: Lucas
     given-names: Maxime
-  -
-    family-names: Petri
+    
+  - family-names: Petri
     given-names: Giovanni
-  -
-    family-names: Patania
+    
+  - family-names: Patania
     given-names: Alice
-  -
-    family-names: Schwarze
+    
+  - family-names: Schwarze
     given-names: Alice
--
-    family-names: Contisciani
+    
+  - family-names: Contisciani
     given-names: Martina
+
 cff-version: "1.1.0"
 license: "BSD-3"
 message: "If you use this software, please cite it using these metadata."
 title: XGI
 version: "0.5.0"
-...