Merge pull request #641 from y-yagi/fix_deprecated_warning

Fix "warning: deprecated Object#=~ is called on Integer"

Author: rafaelfranca

lib/thor/parser/arguments.rb

@@ -9,7 +9,7 @@ def self.split(args)
       arguments = []
 
       args.each do |item|
-        break if item =~ /^-/
+        break if item.is_a?(String) && item =~ /^-/
         arguments << item
       end