Update README.md

Author: andreivictor

README.md

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 # Bootstrap Tooltip Custom Class
-Extend Bootstrap Tooltip plugin by adding custom classes. Available for **Bootstrap 3** and **Boostrap 4**.
-
-Custom classes can be added using `customClass` parameter or via `data-custom-class` attribute.
+Extend Bootstrap Tooltip plugin by adding custom classes to tooltips. Available for **Bootstrap 3** and **Boostrap 4**.
 
 Define your own custom class or use the predefined custom classes: `.tooltip-primary`, `.tooltip-success`, `.tooltip-info`, `.tooltip-warning`, `.tooltip-danger`.