fix: fixes broken readme links (#186)

README.md

@@ -88,6 +88,8 @@ Apache 2.0 - See [LICENSE][license-url] for more information.
 
 [node-gitter-url]: https://gitter.im/open-telemetry/opentelemetry-node?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
 [license-url]: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/master/LICENSE
+[up-for-grabs-issues]: https://github.com/open-telemetry/opentelemetry-js-contrib/issues?q=is%3Aissue+is%3Aopen+label%3Aup-for-grabs
+[good-first-issues]: https://github.com/open-telemetry/openTelemetry-js-contrib/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22
 [otel-plugin-grpc]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-plugin-grpc
 [otel-plugin-http]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-plugin-http
 [otel-plugin-https]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-plugin-https
@@ -101,5 +103,5 @@ Apache 2.0 - See [LICENSE][license-url] for more information.
 [otel-plugin-pg]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/node/opentelemetry-plugin-pg
 [otel-plugin-redis]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/node/opentelemetry-plugin-redis
 [otel-plugin-user-interaction]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/web/opentelemetry-plugin-user-interaction
-[otel-plugin-xml-http-request]: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/master/plugins/web/opentelemetry-plugin-xml-http-request
+[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