Set kernelspec to Py3 in monitoring.pct.py (#1386)
Set kernelspec to Py3 in monitoring.pct.py (#1386)

Quickfix for the failing monitoring.pct.py notebook during the doc generation on CircleCi.

Problem was caused by an unknown Python version in the notebook's kernelspec. It has to be 'name: python3', whereas conda may add a user-specific custom name there.
GPflow/GPflow