Fix typo

Author: shuheilocale

README.md

@@ -72,7 +72,7 @@ Components
 ### MessageBuilder
 
 The type of message that is sent depends on the type of instance of `MessageBuilder`.
-For example, the method sends a text message if you pass `TextMessageBuilder` and it sends an image message if you pass `ImaageMessageBuilder`.
+For example, the method sends a text message if you pass `TextMessageBuilder` and it sends an image message if you pass `ImageMessageBuilder`.
 
 For more detailed information on `MessageBuilder`, see `\LINE\LINEBot\MessageBuilder` and the namespace.