update README.md

Author: Nielsvanpach

README.md

@@ -9,7 +9,7 @@
 This package can be used as to scaffold a framework agnostic package. Follow these steps to get started:
 
 1. Press the "Use template" button at the top of this repo to create a new repo with the contents of this skeleton
-2. Run "php ./configure.sh" to run a script that will replace all placeholders throughout all the files
+2. Run "php ./configure.php" to run a script that will replace all placeholders throughout all the files
 3. Have fun creating your package.
 4. If you need help creating a package, consider picking up our <a href="https://laravelpackage.training">Laravel Package Training</a> video course.
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