[RELEASE] -  new version:  '1.2.1-SNAPSHOT'.
[RELEASE] -  new version:  '1.2.1-SNAPSHOT'.

jfeltesse-mdsol/zipkin,rjbhewei/zipkin,wuqiangxjtu/zipkin,betable/zipkin,rjbhewei/zipkin,mzagar/zipkin,jamescway/zipkin,coursera/zipkin,yshaojie/zipkin,gneokleo/zipkin,rocwzp/zipkin,yshaojie/zipkin,Yelp/zipkin,gneokleo/zipkin,srijs/zipkin,mt0803/zipkin,srijs/zipkin,jamescway/zipkin,lqjack/zipkin,yshaojie/zipkin,betable/zipkin,prat0318/zipkin,thelastpickle/zipkin,thelastpickle/zipkin,srijs/zipkin,betable/zipkin,jstanier/zipkin,wuqiangxjtu/zipkin,mt0803/zipkin,Yelp/zipkin,rjbhewei/zipkin,coursera/zipkin,mt0803/zipkin,thelastpickle/zipkin,betable/zipkin,rocwzp/zipkin,lqjack/zipkin,wuqiangxjtu/zipkin,mzagar/zipkin,jamescway/zipkin,hydro2k/zipkin,mt0803/zipkin,Yelp/zipkin,jamescway/zipkin,jstanier/zipkin,jstanier/zipkin,lqjack/zipkin,mzagar/zipkin,coursera/zipkin,jstanier/zipkin,jfeltesse-mdsol/zipkin,rjbhewei/zipkin,prat0318/zipkin,prat0318/zipkin,Yelp/zipkin,thelastpickle/zipkin,wuqiangxjtu/zipkin,prat0318/zipkin,yshaojie/zipkin,hydro2k/zipkin,jfeltesse-mdsol/zipkin,gneokleo/zipkin,gneokleo/zipkin,hydro2k/zipkin,hydro2k/zipkin,coursera/zipkin,rocwzp/zipkin,srijs/zipkin,jfeltesse-mdsol/zipkin,lqjack/zipkin,mzagar/zipkin,rocwzp/zipkin