Update roles.json

Author: aaryapatil

roles.json

@@ -82,7 +82,7 @@
         "role": "Finance committee member",
         "url": "finance_committee_member",
         "people": [
-            "Kelle Cruz",
+            "Kelle Cruz (chair)",
             "Aarya Patil",
             "John Swinbank",
             "Erik Tollerud"