Added "optimised" word to README.md file

Author: SerhiiCho

README.md

@@ -24,7 +24,7 @@
 
 Date/time converter into "n time ago" format that supports multiple languages. You can contribute any language that you wish easily by creating a pull request. I would gladly merge it in if you follow the simple steps.
 
-This package is well tested and already used in many production apps and has shown itself very well. If you find any issues or bugs 🐞, please create an [issue](https://github.com/SerhiiCho/ago/issues/new), and I'll fix it as soon as I can.
+This package is well tested, optimized and already used in many production apps. It has shown itself pretty well. If you find any issues or bugs 🐞, please create an [issue](https://github.com/SerhiiCho/ago/issues/new), and I'll fix it as soon as I can.
 
 ## Supported PHP versions