Revise README for Category Additional Attributes

Updated README.md to reflect changes in installation steps, features, and version history.

Author: sickdaflip

README.md

@@ -20,7 +20,7 @@ composer require sickdaflip/mage2-core
 ### Step 2: Install Category Additional
 ```bash
 composer config repositories.flipdev/mage2-category-additional vcs https://github.com/sickdaflip/mage2-category-additional.git
-composer require sickdaflip/mage2-category-additional:^1.1
+composer require sickdaflip/mage2-category-additional:dev-main
 ```
 
 ### Step 3: Enable modules
@@ -158,4 +158,5 @@ Philipp Breitsprecher
 [email protected]
 
 ## License
-Proprietary
+
+Proprietary