Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Desktop (please complete the following information):**
+- OS and Thunderbird version
+- Extension version (can be found in the Details tab)
+- Did the extension work for you before, i.e. were emails marked as read correctly when they were received?
+- Are emails in selected folders automatically marked as read on startup? (they should be)
+- Are e-mails in selected folders automatically marked as read when a button in the options is pressed? (they should be)
+- When you go to Tools -> Developer Tools -> Error Console, are there any errors that appear when a new message is received in a selected folder?
+- Are you using IMAP or POP3 account?
+- Does the selected folder contain some extra characters, such as Unicode characters?
+- Does the account name to which the selected folder belongs contain some special characters?
+
+**Additional context**
+Add any other context about the problem here.
+
+**Log data**
+Please enable logging in addon options and paste the debug log here (Tools -> Developer Tools -> Error Console)