Point to OpenTracing API

Author: yurishkuro

README.md

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 [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![Appveyor Build][appveyor]][appveyor] [![OpenTracing 1.0 Enabled][ot-img]][ot-url]
 
 # jaeger-client-cpp
-C++ OpenTracing binding for [Jaeger](https://www.jaegertracing.io/)
+[Jaeger](https://www.jaegertracing.io/) SDK with [OpenTracing API for C++](https://github.com/opentracing/opentracing-cpp) binding.
 
 ## Contributing