Update papermill version to avoid nbconvert bug with nbconvert>=5.6

[fchouteau]

There was an nbconvert update in nbconvert=>5.6 which add an argument to run_cell, which makes papermill < 1.0.1 fail on notebook execution

File "/opt/miniconda/lib/python3.6/site-packages/papermill/preprocess.py", line 27, in preprocess
nb, resources = self.papermill_process(nb_man, resources)
File "/opt/miniconda/lib/python3.6/site-packages/papermill/preprocess.py", line 76, in papermill_process
nb.cells[index], resources = self.preprocess_cell(cell, resources, index)
File "/opt/miniconda/lib/python3.6/site-packages/nbconvert/preprocessors/execute.py", line 438, in preprocess_cell
reply, outputs = self.run_cell(cell, cell_index, store_history)
TypeError: run_cell() takes from 2 to 3 positional arguments but 4 were given

This issue has been resolved with papermill versions above 1.0.1

Ref:
Nbconvert PR: jupyter/nbconvert#1055
Papermill issue: nteract/papermill#410

The following PR upgrades papermill to >=1.0.1, which should solve the issue (at least on the use cases I ran)

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[fchouteau]

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[sirtorry]

thank you for this PR.