Update package_sparkfun_index.json

Author: oclyke

IDE_Board_Manager/package_sparkfun_index.json

@@ -14,7 +14,7 @@
           "architecture": "apollo3",
           "version": "1.0.20",
           "category": "Contributed",
-          "url": "https://github.com/sparkfun/Arduino_Apollo3/archive/v1.0.12_ble-beta.tar.gz",
+          "url": "https://github.com/sparkfun/Arduino_Apollo3/archive/v1.0.20_ble-beta.tar.gz",
           "archiveFileName": "Arduino_Apollo3-1.0.20_ble-beta.tar.gz",
           "checksum": "SHA-256:da6de17179dda462a1a2abd0ab1f384e4fcfe0ad0e581fd4720f254042767bce",
           "size": "63501439",