Fix typo "whitout" to "without".

AUTHORS

@@ -1,7 +1,7 @@
 Sinatra was designed and developed by Blake Mizerany (bmizerany) in
 California.
 
-Sinatra would not have been possible whithout strong company backing.
+Sinatra would not have been possible without strong company backing.
 In the past, financial and emotional support have been provided mainly by
 [Heroku](http://heroku.com), [GitHub](http://github.com) and
 [Engine Yard](http://www.engineyard.com/), and is now taken care of by