Make `GlobUtils` extend `self` for easier access

spec/ameba/glob_utils_spec.cr

@@ -1,11 +1,7 @@
 require "../spec_helper"
 
 module Ameba
-  struct GlobUtilsClass
-    include GlobUtils
-  end
-
-  subject = GlobUtilsClass.new
+  subject = GlobUtils
   current_file_basename = File.basename(__FILE__)
   current_file_path = "spec/ameba/#{current_file_basename}"
 

src/ameba/glob_utils.cr

@@ -1,6 +1,8 @@
 module Ameba
   # Helper module that is utilizes helpers for working with globs.
   module GlobUtils
+    extend self
+
     # Returns all files that match specified globs.
     # Globs can have wildcards or be rejected:
     #