Update issue templates

.github/ISSUE_TEMPLATE/report-an-issue.md

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+---
+name: Report an issue
+about: Report an issue with Nodemailer
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please fill the following questionnaire about your issue:
+
+1. What kind of issue are you reporting?
+- [ ] A bug in Nodemailer
+- [ ] A bug in a plugin of Nodemailer (eg. issues with nodemailer-sendgrid)
+- [ ] Feature request
+- [ ] Looking for help to resolve some kind of problem with Nodemailer
+
+2. Are you listed as a sponsor of Nodemailer project (see Sponsors button above)?
+- [ ] Yes. Sponsors get priority support
+- [ ] No. Unless it is a bug in Nodemailer you might find support from public forums like [StackOverflow](https://stackoverflow.com/search?q=nodemailer).
+
+3. State your problem here: