fix bug: check appid not work for old GoAgent deployed appid, add sto…

…p check all exist ip, release 2.8.5

release 2.8.4

check ipv6 before enable it

release new version

new version release

release 2.8.0

fix bug: XX-net#1510, remove ip connect interval but not tested.

release new version

release new version for 2.7.1

Merge pull request XX-net#1445 from yeahwu/patch-1

Update README.md

很好的贡献，哈哈