default ResponseInterceptor.Chain enrich(ResponseInterceptor.Chain chain) {
    return chain;
  }
Capabilities expose core feign artifacts to implementations so parts of core can be customized
around the time the client being built.

<p>For instance, capabilities take the {@link Client}, make changes to it and feed the modified
version back to feign.

@see Metrics5Capability
core/src/main/java/feign/Capability.java