docs: update dns status and add hapi koa (#212)

Signed-off-by: Naseem <[email protected]>

README.md

@@ -62,7 +62,9 @@ OpenTelemetry can collect tracing data automatically using plugins. Vendors/User
 - [@opentelemetry/plugin-redis][otel-plugin-redis]
 - [@opentelemetry/plugin-ioredis][otel-plugin-ioredis]
 - [@opentelemetry/plugin-express][otel-plugin-express]
-- [@opentelemetry/plugin-dns][otel-plugin-dns] - By default, this plugin is not loaded [#612](https://github.com/open-telemetry/opentelemetry-js/issues/612)
+- [@opentelemetry/plugin-dns][otel-plugin-dns]
+- [@opentelemetry/hapi-instrumentation][otel-contrib-hapi-instrumentation]
+- [@opentelemetry/koa-instrumentation][otel-contrib-koa-instrumentation]
 
 ### Web Plugins
 
@@ -131,3 +133,5 @@ Apache 2.0 - See [LICENSE][license-url] for more information.
 [otel-plugin-xml-http-request]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-plugin-xml-http-request
 [otel-plugin-express]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/node/opentelemetry-plugin-express
 [otel-plugins-node-core-and-contrib]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/metapackages/plugins-node-core-and-contrib
+[otel-contrib-hapi-instrumentation]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/node/opentelemetry-hapi-instrumentation
+[otel-contrib-koa-instrumentation]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/node/opentelemetry-koa-instrumentation