Add to readme about mina-unicorn

[tagliala]

Hi,

this is because this information on the readme is wrong: https://github.com/scarfacedeb/mina-unicorn#usage

unicorn_pid - unicorn pid file, default shared/tmp/pids/unicorn.pid

It actually defaults to current_path: https://github.com/scarfacedeb/mina-unicorn/blob/master/lib/mina/unicorn/tasks.rb#L11

@scarfacedeb is this gem still maintained?

[scarfacedeb]

@tiredenzo Thank you for your suggestion, I added it to README.

@tagliala Yes, it's still maintained.

The information in README was correct if you set shared_paths as described above.
In other words, tmp directory in "#{deploy_to}/#{current_path}/tmp/pids/unicorn.pid" path should resolve to a symbolic link to shared/tmp/pids.

[tagliala]

@scarfacedeb thanks!