update readme #19

Author: kitar

README.md

@@ -78,7 +78,7 @@ $ composer require kitar/laravel-dynamodb
 
 ### Laravel (6.x, 7.x, 8.x, 9.x)
 
-Add dynamodb configs to config/database.php:
+Add dynamodb configs to `config/database.php`:
 
 ```php
 'connections' => [
@@ -98,6 +98,12 @@ Add dynamodb configs to config/database.php:
 ],
 ```
 
+Update the `DB_CONNECTION` variable in your `.env` file:
+
+```
+DB_CONNECTION=dynamodb
+```
+
 ### Non-Laravel projects
 
 For usage outside Laravel, you can create the connection manually and start querying with [Query Builder](#query-builder).