Update README.md

README.md

@@ -26,9 +26,9 @@ Simple PHP script that adds a very basic API to a MySQL database
 
 URL: http://localhost/api/cate*
 
-'''
+```
 {"categories":[["id","name"],["1","Internet \/ ICT \/ Technology"],["3","Web development \/ Programming"]]}
-'''
+```
 
 ## Installation