Migration from `master` to `main` default branch

[valeriupredoi]

Just a heads up that I completed the migration of the default branch from master to main: all PRs have now been moved to target:main, and branch master has been deleted 🍻

[kmuehlbauer]

@valeriupredoi I do not know how smart GH Actions are, but in the CI we would tell to use main instead of master ->

pyfive/.github/workflows/pytest.yml

Lines 6 to 11 in 917025b

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	schedule:

[valeriupredoi]

@kmuehlbauer good call! I'll change that too - default branch should be name agnostic. Thanks for the pointer 🍺

[valeriupredoi]

this is now done, and corrected for all the bits and bobs that might have broken 🍺