fix example

Author: saskiad

examples/fip_ophys_rig.json

@@ -57,6 +57,7 @@
             "recording_software": {
                "name": "Bonsai",
                "version": "2.5",
+               "url": null,
                "parameters": null
             },
             "driver": null,
@@ -115,6 +116,7 @@
             "recording_software": {
                "name": "Bonsai",
                "version": "2.5",
+               "url": null,
                "parameters": null
             },
             "driver": null,