Update README.md

Author: toni-suarez

README.md

@@ -9,9 +9,9 @@
 A lightweight way to handle UTM parameters session-based in your Laravel Application.
 
 ```blade
-@if(has_utm('source', 'newsletter'))
+@hasUtm('source', 'newsletter')
   <p>Special Content for Newsletter-Subscriber.</p>
-@endif
+@endhasUtm
 ```
 
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