fix evaluation order when detecting cmd_name

Apparently the '=' operator binds stronger than the 'or' operator:

  $ irb
  irb(main):001:0> array = []
  => []
  irb(main):002:0> cmd_name = array.shift or "status"
  => "status"
  irb(main):003:0> cmd_name.inspect
  => "nil"
  irb(main):004:0> cmd_name = (array.shift or "status")
  => "status"
  irb(main):005:0> cmd_name.inspect
  => "\"status\""

Put a pair of braces around it to fix the order.

Author: rohieb

bin/nom

@@ -26,7 +26,7 @@ aliases = {
 
 nom = Nom::Nom.new
 
-cmd_name = ARGV.shift or "status"
+cmd_name = (ARGV.shift or "status")
 
 if aliases.include? cmd_name.to_sym
     cmd_name = aliases[cmd_name.to_sym]