Rakefile in pgtk-0.9.2 vs Rakefile in pgtk-0.9.4

@@ -63,10 +63,10 @@
 require 'xcop/rake_task'
 desc 'Validate all XML/XSL/XSD/HTML files for formatting'
 Xcop::RakeTask.new :xcop do |task|
   task.license = 'LICENSE.txt'
   task.includes = ['**/*.xml', '**/*.xsl', '**/*.xsd', '**/*.html']
-  task.excludes = ['target/**/*', 'coverage/**/*']
+  task.excludes = ['target/**/*', 'coverage/**/*', 'vendor/**/*']
 end
 
 task :copyright do
   sh "grep -q -r '2019-#{Date.today.strftime('%Y')}' \
     --include '*.rb' \