bin/brief in brief-1.17.10 vs bin/brief in brief-1.17.11

@@ -23,10 +23,10 @@
   program :version, Brief::VERSION 
   
   # Eager load the briefcase so that the call to Brief.load_commands()
   # will pick up the briefcase app's model classes
   if ARGV.include?('--root')
-    index = ARGV.index_of('--root')
+    index = ARGV.index('--root')
 
     if value = ARGV[index + 1]
       $briefcase = Brief::Briefcase.new(root: value)
     end
   elsif Pathname(Brief.pwd).join("brief.rb").exist?