Adjust error message when root permissions are required

[atmosx]

[user@server ]$ f2bread -i
/home/atma/.rvm/gems/ruby-2.0.0-p195/gems/f2bread-0.0.1/lib/f2bread.rb:35:in readlines': Permission denied - /var/log/fail2ban.log (Errno::EACCES) from /home/atma/.rvm/gems/ruby-2.0.0-p195/gems/f2bread-0.0.1/lib/f2bread.rb:35:ininitialize'
from /home/atma/.rvm/gems/ruby-2.0.0-p195/gems/f2bread-0.0.1/bin/f2bread:66:in new' from /home/atma/.rvm/gems/ruby-2.0.0-p195/gems/f2bread-0.0.1/bin/f2bread:66:in<top (required)>'
from /home/atma/.rvm/gems/ruby-2.0.0-p195/bin/f2bread:23:in load' from /home/atma/.rvm/gems/ruby-2.0.0-p195/bin/f2bread:23:in

'
from /home/atma/.rvm/gems/ruby-2.0.0-p195/bin/ruby_noexec_wrapper:14:in eval' from /home/atma/.rvm/gems/ruby-2.0.0-p195/bin/ruby_noexec_wrapper:14:in'