Typo

Author: Stefano Cortese

README.md

@@ -2,7 +2,7 @@
 This utility allow you to convert CSV and JSON files to Laravel seeders.
 
 ## Usage
-Create ```./files``` and ```./output``` folder in project root. 
+Create ```./files``` and ```./output``` folders in project root. 
 Put the files you want to convert in ```./files``` folder. 
 Run ```convert.php``` script and follow the instructions.