renamed camel case index file names

fs.go

@@ -33,7 +33,7 @@ type FS struct {
 	UseLocalFolder    bool
 	LocalFolderPrefix string
 	HeaderHandler     HeaderHandler
-	IndexFilenames    []string
+	IndexFileNames    []string
 }
 
 // NewFS creates a new instance of the http file system used for serving static files.
@@ -109,7 +109,7 @@ func (fs *FS) checkFolder(file fs.File, url string) (fs.File, bool) {
 		_ = file.Close()
 
 		// check for index files
-		for _, indexFileName := range fs.IndexFilenames {
+		for _, indexFileName := range fs.IndexFileNames {
 			newFullPath := path.Join(url, indexFileName)
 			if newFile, err := fs.findFile(newFullPath); err == nil {
 				return newFile, true