v2.1.0 changelog

Fix #147: Make timestamps in generated report more accurate.
Fix #140: Escape illegal XML characters in junit output.
Fix #145: Handle build errors in test packages with the _test suffix.
Fix #145: Don't ignore build errors that did not belong to a package.
Fix #134: Json test output was not parsed correctly when using the -race flag in go test.
Add support for === NAME lines introduced in Go1.20
junit: Add File attribute to testsuite.
junit: Allow multiple properties with the same name.
junit: Add the Testsuites.WriteXML convenience method.

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