Clean up build argument list and add note on lightstep tracer #276
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The LIGHTSTEP_VERSION and ZIPKIN_CPP_VERSION build arguments were removed in https://github.com/opentracing-contrib/nginx-opentracing/pull/155/files#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L6-L7. The NGINX_OPENTRACING_VERSION build argument was removed in https://github.com/opentracing-contrib/nginx-opentracing/pull/37/files#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L10. This pr cleans up the list of build arguments available for use.
Worth noting: it looks like Zipkin now supports OpenTracing 1.6.0. Maybe we should add the Zipkin tracer back in to the docker image?