Add 3.0.2 release notes

Set version to 3.0.2

Actions: update versions, restore and run tests before publishing

Override the Newline setter. Fixes #15

Remove support for .NET Standard 1.4

Use .NET 4.8 for legacy tests

Update to .NET 9

Update README.md

Add 3.0.1 release notes

Update deps

Set version to 3.0.1

Add a couple of additional tests; thanks, @lordfanger

Add InterpolatedStringHandler overload for Write method; thanks, @lordfanger

Fix some whitespace

Fix several style attribute issues; thanks, Ondřej Kubíček