Comment indented bash commands

[mwouts]

Closes #437

[codecov]

Codecov Report

Merging #439 into master will increase coverage by 1.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #439      +/-   ##
==========================================
+ Coverage   97.97%   99.02%   +1.04%     
==========================================
  Files          77       77              
  Lines        7720     7725       +5     
==========================================
+ Hits         7564     7650      +86     
+ Misses        156       75      -81

Impacted Files	Coverage Δ
tests/test_read_simple_python.py	100% <100%> (ø)	⬆️
jupytext/magics.py	100% <100%> (ø)	⬆️
tests/test_pep8.py	98.38% <0%> (ø)	⬆️
tests/test_black.py	100% <0%> (ø)	⬆️
tests/test_active_cells.py	100% <0%> (ø)	⬆️
tests/test_knitr_spin.py	100% <0%> (ø)	⬆️
tests/test_compare.py	100% <0%> (ø)	⬆️
tests/test_ipynb_to_rmd.py	100% <0%> (ø)	⬆️
tests/conftest.py	100% <0%> (ø)	⬆️
tests/test_metadata_filter.py	100% <0%> (ø)	⬆️
... and 26 more

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