[RAILS] Fixed incorrect regex for adding Rails instrumentation into the application.rb in the 02-pretty.rb template

Author: karmi

elasticsearch-rails/lib/rails/templates/02-pretty.rb

@@ -29,8 +29,8 @@
 puts        '-'*80, ''; sleep 0.25
 
 insert_into_file 'config/application.rb',
-                 "\n\nrequire 'elasticsearch/rails/instrumentation'\n",
-                 after: 'Bundler.require(:default, Rails.env)'
+                 "\n\nrequire 'elasticsearch/rails/instrumentation'",
+                 after: /Bundler\.require.+$/
 
 git add:    "config/application.rb"
 git commit: "-m 'Added the Rails logger integration to application.rb'"