release 3.0.0-alpha

fixed: license header

update changelog

enchancement: add shipit script

fixed dubbo-servie types

Merge pull request #200 from hufeng/v3.0.0

remove _agentAddrSet

release dubbo2.js@2.3.9

release dubbo2.js@2.3.8

release dubbo2.js@2.3.7

release dubbo2.js@2.3.6