Update README.md

Author: EmadAdly

README.md

@@ -7,7 +7,7 @@
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-A simple, automatic UUID generator for any model based on Laravel 5.7, By using this package when each new entry you will get the following :
+A simple, automatic UUID generator for any model based on Laravel 5.5 and above, By using this package when each new entry you will get the following :
 
 * Generate `uuid` automatically .
 * Assign it to `uuid` field in database automatically.