Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: If you've found a bug in PHPMailer, this is the right place to report it
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please check these things before submitting your issue:
+
+- [ ] *Read the error message* you're seeing - it often tells you what is wrong, and may contain useful links & instructions
+- [ ] Make sure you're using the latest version of PHPMailer
+- [ ] Check that your problem is not dealt with in [the troubleshooting guide](https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting), especially if you're having problems connecting to Gmail or GoDaddy
+- [ ] Include sufficient code to reproduce your problem
+- [ ] If you're having an SMTP issue, include the debug output generated with `SMTPDebug = 2` set
+- [ ] If you have a question about how to use PHPMailer (rather than reporting a bug in it), tag a question on Stack Overflow with `phpmailer`, but [**search first**](http://stackoverflow.com/questions/tagged/phpmailer)!
+
+# Problem description
+
+# Code to reproduce
+
+# Debug output