Bump opentracing version to 0.20.7
Bump opentracing version to 0.20.7

objectiser/hawkular-apm,hawkular/hawkular-btm,objectiser/hawkular-btm,hawkular/hawkular-btm,jpkrohling/hawkular-btm,objectiser/hawkular-apm,jpkrohling/hawkular-btm,objectiser/hawkular-apm,objectiser/hawkular-btm,objectiser/hawkular-btm,jpkrohling/hawkular-apm,jpkrohling/hawkular-apm,hawkular/hawkular-btm,hawkular/hawkular-apm,hawkular/hawkular-btm,hawkular/hawkular-apm,jpkrohling/hawkular-btm,objectiser/hawkular-apm,hawkular/hawkular-apm,jpkrohling/hawkular-btm,hawkular/hawkular-apm,jpkrohling/hawkular-apm,jpkrohling/hawkular-btm,jpkrohling/hawkular-apm,objectiser/hawkular-btm,hawkular/hawkular-btm,hawkular/hawkular-apm,objectiser/hawkular-apm,objectiser/hawkular-btm,jpkrohling/hawkular-apm