incorrect kernelspec causes failures.

[flamingbear]

In reviewing #116, I couldn't run the notebook and and it looked like it was failing to find the correct conda env.

./run_notebooks.sh sambah
<[snip]>
RuExecuting:   0%|          | 0/25 [00:00<?, ?cell/s]Kernelspec name papermill-sambah cannot be found!
No such kernel named papermill-sambah

Investigation showed ipython notebook had an unexpected kernelspec.

The samba metadata in the ipython notebook was:

"kernelspec": {
"display_name": "papermill-sambah",
"language": "python",
"name": "papermill-sambah"

vs the spec in a working notebook

  "celltoolbar": "Tags",
  "kernelspec": {
   "display_name": "Python 3 (ipykernel)",
   "language": "python",
   "name": "python3"
  },

Changing the name to python3 enabled the test to run correctly.

Danny said he had generated he .ipynb file via jupyterlab. I think that's a good place to start, but we should fix this so that it doesn't matter how you generated the iPython notebook test file.