Update tests for typer 0.4.0 and click 8

[jayqi]

Recently typer released 0.4.0, which also increases the version ceiling of click to include click 8. This has some changes to behavior that broke some of our tests:

• Calling nbautoexport without any commands now errors with code 2 instead of succeeding.
  • This is probably a good change because running this command doesn't successfully do anything.
  • It no longer prints the help text anymore, which is maybe less desirable. I opened https://github.com/tiangolo/typer/issues/328 on tiangolo/typer about this.
• Invalid option values had their error message slightly changed. This updates our asserts to work with the new error text.
  • Before: "Invalid value for '--organize-by' / '-b': invalid choice: invalid-organize-by"
  • After: Invalid value for '--organize-by' / '-b': 'foo' is not one of 'notebook', 'extension'.

Fixes #76

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-77--zen-roentgen-1e5a72.netlify.app

[codecov[bot]]

Codecov Report

Merging #77 (2f4e035) into master (3e9a1ed) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #77   +/-   ##
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  Coverage    98.1%   98.1%           
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  Files           8       8           
  Lines         382     382           
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  Hits          375     375           
  Misses          7       7