Update README.md

Javascript/README.md

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 ⚠️However, there is room for improvement in terms of efficiency. For instance, the Math.exp(x) function can calculate the square root of a number x, but it has limitations such as the inability to accept multiple parameters and the inability to map the function to different data types like Arrays and Objects.
 
-💡 In zikojs, I have addressed these limitations, providing a more versatile and efficient solution.
+💡 In zikojs, I have addressed these limitations, providing a more versatile and efficient solution using the `mapfun` utility
 
 # mapfun