Merge pull request #69 from adyliu/dependabot/maven/com.fasterxml.jackson.core-jackson-databind-2.12.6.1

Bump jackson-databind from 2.9.8 to 2.12.6.1

so sad of version

fixed version of netty for travis

rollback version of netty

fixed unittest

upgrade version of junit

add log of topic creator

Merge pull request #62 from adyliu/dependabot/maven/io.netty-netty-all-4.1.42.Final

Bump netty-all from 4.1.36.Final to 4.1.42.Final

change thread name of autocommit

update README

upgrade some dependencies for CVE-2018-19360 and others

update some depenencies to latest version

update readme