Update exercises/split-second-stopwatch/canonical-data.json

Author: ErikSchierboom

exercises/split-second-stopwatch/canonical-data.json

@@ -673,6 +673,9 @@
             "command": "previousLaps",
             "expected": ["00:00:10", "00:00:20"]
           },
+          {
+            "command": "stop"
+          },
           {
             "command": "reset"
           },