Update release instructions to publish artifacts for different scala versions
Update release instructions to publish artifacts for different scala versions

Author: vjagadish1989 <jvenkatr@linkedin.com>

Reviewers: Jake Maes<jmakes@apache.org>, Prateek Maheshwari<pmaheshw@linkedin.com>

Closes #222 from vjagadish1989/release-instr

lhaiesp/samza,bharathkk/samza,TiVo/samza,apache/samza,abhishekshivanna/samza,prateekm/samza,apache/samza,TiVo/samza,TiVo/samza,lhaiesp/samza,prateekm/samza,fredji97/samza,prateekm/samza,prateekm/samza,apache/samza,lhaiesp/samza,bharathkk/samza,fredji97/samza,lhaiesp/samza,TiVo/samza,abhishekshivanna/samza,abhishekshivanna/samza,bharathkk/samza,fredji97/samza,abhishekshivanna/samza,apache/samza,TiVo/samza,apache/samza,fredji97/samza,fredji97/samza,abhishekshivanna/samza,lhaiesp/samza,bharathkk/samza,prateekm/samza,bharathkk/samza