add kernelspec to test notebook

Author: djherbis

tests/data/notebook.ipynb

@@ -11,6 +11,7 @@
     }
   ],
   "metadata":{
+    "kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},
     "language_info":{
        "codemirror_mode":{
           "name":"ipython",
@@ -26,4 +27,4 @@
   },
   "nbformat":4,
   "nbformat_minor":4
-}
+}