README.md in opentelemetry-instrumentation-concurrent_ruby-0.12.0 vs README.md in opentelemetry-instrumentation-concurrent_ruby-0.13.0

@@ -41,9 +41,9 @@
 Apache 2.0 license. See [LICENSE][license-github] for more information.
 
 [concurrent-ruby-home]: https://github.com/ruby-concurrency/concurrent-ruby
 [bundler-home]: https://bundler.io
 [repo-github]: https://github.com/open-telemetry/opentelemetry-ruby
-[license-github]: https://github.com/open-telemetry/opentelemetry-ruby/blob/master/LICENSE
+[license-github]: https://github.com/open-telemetry/opentelemetry-ruby/blob/main/LICENSE
 [ruby-sig]: https://github.com/open-telemetry/community#ruby-sig
 [community-meetings]: https://github.com/open-telemetry/community#community-meetings
 [ruby-gitter]: https://gitter.im/open-telemetry/opentelemetry-ruby