Alejandro Researchgate URL updated

Author: dcamarmas

public/content/authors.yml

@@ -19,5 +19,5 @@ acaldero:
   affiliation: ARCOS Group, UC3M
   links:
     github: acaldero
-    researchgate: Alejandro-Calderon-Mateos
+    researchgate: Alejandro-Calderon-4
     linkedin: alejandro-calderon-mateos