New features
Added @newrelic/koa as a dependency.
This introduces instrumentation for Koa v2.0.0 or higher. It will be treated as first-party instrumentation within the agent, but publishing it as a separate module allows it to be installed independently according to users' needs.
Improvements
Refactored instrumentation hooks to work with modules.
With this change it is now possible to link against external instrumentation modules.