9.15.0

Prerelease 9.15.0-pre (#2927)

* bump version

---------

Co-authored-by: newrelic-ruby-agent-bot <ruby-agent@newrelic.com>
Co-authored-by: Hannah Ramadan <76922290+hannahramadan@users.noreply.github.com>

9.15.0-pre

bump version

9.14.0

Merge pull request #2873 from newrelic/2870_test_and_changelog_entry

unit test and CHANGELOG entry for 2870

9.14.0-pre

bump version

9.13.0

Merge pull request #2827 from newrelic/prerelease_updates_9.13.0-pre

Prerelease 9.13.0-pre

9.13.0-pre

bump version

9.12.0

Merge pull request #2772 from newrelic/update-newrelic-yml

Add security agent content back to newrelic.yml

9.12.0-pre

bump version

9.11.0

Merge pull request #2725 from newrelic/prerelease_updates_9.11.0-pre

Prerelease 9.11.0-pre

9.11.0-pre

bump version