Typo: changed attributes from three to a generic message

Attributes might increase over time, explicitly mentioning three (or four as of now) can later be overlooked and missed, so changed it to "following attributes" as per the table

README.md

@@ -42,7 +42,7 @@ Then simply use the web component as:
 <random-color-svg width="92px" height="92px" username=""></random-color-svg>
 ```
 
-> Supports three optional attributes, height and width for sizing the svg, and a username attribute to get a hashed color (optional). Also, it has getter and setter methods for color. Colors attribute is a string of 15 hex color codes.
+> Supports the following optional attributes, height and width for sizing the svg, and a username attribute to get a hashed color (optional). Also, it has getter and setter methods for color. Colors attribute is a string of 15 hex color codes.
 
 | Attribute  | Description                                         | Default     |
 | ---------- | --------------------------------------------------- | ----------- |