add merchant giacobbe&co

_data/merchants.yml

@@ -237,6 +237,8 @@
       url: http://art2unlimited.webs.com/
     - name: Game of Cryptos
       url: https://gameofcryptos.com/
+    - name: Giacobbe & Co. - Diamond and gemstone jewelry
+      url: https://giacobbeandco.com/
     - name: Hammock Universe
       url: https://www.hammockuniverseusa.com/
     - name: Handcrafted goods