No tracing appears

[uthornbl]

Please make the README a bit more explicit.
I added the dependency to my pom:

<dependency>

            <groupId>io.github.openfeign.opentracing</groupId>
            <artifactId>feign-opentracing-parent</artifactId>
            <version>0.1.0</version>
</dependency>

That had no effect on logging or HTTP headers.
I tried introducing the ".client" statement but I obviously need to import libs - which ones?

    @Bean
    public BlackduckClient getBlackduckClient(@Value("${application.blackduck_url}") String url) {

        return Feign.builder()
                .client(new TracingClient(feignCompatibleClient, tracer))
                .encoder(new FormEncoder(new GsonEncoder()))
                .decoder(new GsonDecoder())
                .target(BlackduckClient.class, url);
    }

Any help much appreciated.