add TLS note (#3077)
add TLS note (#3077)


openzipkin/zipkin,openzipkin/zipkin,adriancole/zipkin,adriancole/zipkin,twitter/zipkin,adriancole/zipkin,openzipkin/zipkin,openzipkin/zipkin,twitter/zipkin,adriancole/zipkin,openzipkin/zipkin,twitter/zipkin,twitter/zipkin