release tasks for eml-2.0.0rc3
This is a tracking bug for tasks that need to be doen for the eml-2.0.0 release.
Add any housekeeping, non-controversial tasks that need to be done here.
1) Update all namespace names from eml-2.0.0rc2 to eml-2.0.0
2) Finalize bug list in README
3) Validate that all tests are passed
4) Review documentation on id/references rules in the spec