update readme

Author: themsaid

README.md

@@ -6,7 +6,7 @@ translation lines with ease. Taking care of a multilingual interface is not a he
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-<img src="http://s15.postimg.org/3lfrbeg7t/langman_2.gif">
+<img src="http://s15.postimg.org/3lfrbeg7t/langman_2.gif" alt="Laravel Langman">
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