Include Jonathan Higham within the CITATION.cff file

Author: harryswift01

CITATION.cff

@@ -37,6 +37,11 @@ authors:
     email: rhen7213@uni.sydney.edu.au
     affiliation: University of Sydney
     orcid: 'https://orcid.org/0000-0002-0461-6625'
+  - given-names: Jonathan
+    family-names: Higham
+    email: j.higham4@lancaster.ac.uk
+    affiliation: Lancaster University
+    orcid: 'https://orcid.org/0000-0002-9779-9968'
   - given-names: Jas
     family-names: Kalayan
     email: jas.kalayan@stfc.ac.uk