Give guidance when a CODEOWNER wants to leave a project

Author: NathanielRN

Diff for: README.md

@@ -82,6 +82,7 @@ To release a package as `1.0` stable, the package MUST...:
   - e.g. Instrumentation packages might use different techniques to instrument different major versions of python packages
 - [ ] Have clear documentation for non-obvious usages of the package
   - e.g. If an instrumentation package uses flags, a token as context, or parameters that are not typical of the `BaseInstrumentor` class, these are documented
+- [ ] After `1.0`, a CODEOWNER may no longer feel like they have the bandwidth to meet the responsibilities of maintaining the package. That's not a problem at all, life happens! However, if that is the case, we ask that the CODEOWNER please raise an issue indicating that they would like to be removed as a CODEOWNER so that they don't get pinged on future PRs. Ultimately, we hope to use that issue to find a new CODEOWNER.
 
 ## Contributing