Fix the setting name for whitelisting files

Author: theofidry

README.md

@@ -136,7 +136,7 @@ return [
     'prefix' => null,                       // string|null
     'finders' => [],                        // Finder[]
     'patchers' => [],                       // callable[]
-    'whitelisted-files' => [],              // string[]
+    'files-whitelist' => [],                // string[]
     'whitelist' => [],                      // string[]
     'whitelist-global-constants' => true,   // bool
     'whitelist-global-classes' => true,     // bool
@@ -266,7 +266,7 @@ return [
 
 ### Whitelisted files
 
-For the files listed in `whitelisted-files`, their content will be left
+For the files listed in `files-whitelist`, their content will be left
 untouched during the scoping process.