Change ChEBI logo URL (#2784)

Updated the ChEBI logo URL

Author: CarMoreno

ontology/chebi.md

@@ -15,7 +15,7 @@ contact:
   github: amalik01
   label: Adnan Malik
   orcid: 0000-0001-8123-5351
-depicted_by: https://www.ebi.ac.uk/chebi/images/ChEBI_logo.png
+depicted_by: https://www.ebi.ac.uk/chebi/chebi_logo.svg
 description: A structured classification of molecular entities of biological interest focusing on 'small' chemical compounds.
 domain: chemistry and biochemistry
 homepage: http://www.ebi.ac.uk/chebi