TCK - ZSH Autocomplete

[Daniel Cunha]

Hi folks,

I sent a PR to update README.adoc for TCK project with instructions to
enable the autocomplete for runtests on ZSH as well.

Please, review it:
https://github.com/apache/tomee-tck/pull/7

-- 
Daniel "soro" Cunha
https://twitter.com/dvlc_