Document explicitly that dotfiles and vcs files are ignored by default

This change makes it clear whether or not each of those two options are enabled by default.

Without this documentation one has to look into the code.

Author: mnapoli

Finder.php

@@ -402,6 +402,8 @@ public function exclude($dirs)
     /**
      * Excludes "hidden" directories and files (starting with a dot).
      *
+     * This option is enabled by default.
+     *
      * @param bool $ignoreDotFiles Whether to exclude "hidden" files or not
      *
      * @return $this
@@ -422,6 +424,8 @@ public function ignoreDotFiles($ignoreDotFiles)
     /**
      * Forces the finder to ignore version control directories.
      *
+     * This option is enabled by default.
+     *
      * @param bool $ignoreVCS Whether to exclude VCS files or not
      *
      * @return $this