Restrict Email Providers on Registration

[Aleksi "Lex" Kilpinen]

i adapted this mod for 2.0.18 last update today, greetings my friends

Edit: Removed attachment due to unclear licensing of the original. -Lex

Thank you for the well meaning effort, but because the original does not include a clearly permissive license, and the package has not gone through the usual mod review procedure, I had to remove your updated package.