Fix typo

Author: gjbex

source-code/command-line-arguments/Fire/sayer.py

@@ -55,7 +55,7 @@ def __init__(self, hello_name=None, bye_name=None):
         self.bye =  Bye(bye_name)
 
     def to(self):
-        return 'Do you want to say hello or bye'
+        return 'Do you want to say hello or bye?'
 
     def info(self):
         return 'This is version 0.1beta'