Fix unicode filename

git-svn-id: https://plugins.svn.wordpress.org/sendgrid-email-delivery-simplified/trunk@1033080 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix unicode filename

git-svn-id: https://plugins.svn.wordpress.org/sendgrid-email-delivery-simplified/trunk@1033081 b8457f37-d9ea-0310-8a92-e5e31aec5664