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

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