Choose 'png' image compression in BqplotImageView by default #457

Job	Run time
initial_checks / Load tox environments	5s
initial_checks / codestyle (ubuntu-latest)	23s
tests / Load tox environments	6s
no_coverage / Load tox environments	9s
tests / py38-test (ubuntu-latest)	1m 48s
tests / py39-test (ubuntu-latest)	2m 1s
tests / py310-test (ubuntu-latest)	1m 57s
tests / py311-test (ubuntu-latest)	1m 53s
tests / py38-test (macos-12)	4m 11s
tests / py39-test (macos-12)	2m 49s
tests / py311-test (macos-latest)	1m 30s
tests / py38-test (windows-latest)	4m 16s
tests / py39-test (windows-latest)	3m 1s
tests / py310-test (windows-latest)	3m 3s
no_coverage / py39-notebooks (windows-latest)	2m 39s
no_coverage / py38-notebooks (macos-12)	2m 21s
no_coverage / py310-notebooks (ubuntu-latest)	1m 27s
no_coverage / py311-docs (ubuntu-latest)	1m 19s
no_coverage / py39-docs (macos-12)	3m 21s
no_coverage / py38-docs (windows-latest)	3m 40s
publish / Build source and wheel distribution	3m 24s
	45m 23s

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