docs(readme): Add information about Discord.js v12.

Author: Ayfri

README.md

@@ -5,7 +5,9 @@
 
 # Better-Embed
 
-A npm package for helping you create better Discord.js Embeds.
+A npm package for helping you create better Discord.js v13 Embeds.
+> Note :<br>
+> Version `1.3.0` is not compatible with Discord.js v12, `1.2.1` is but is deprecated.
 
 ## How to use + Documentation